In order to be well received, an actor need not be on stage all the way through the play, as long as he performs satisfactorily in the scenes in which his character appears. In the same way, a wise man need not feel that he must loiter to the very end of the very last act. To demonstrate virtue and excellent character, a short life is long enough.
 
[Neque enim histrioni, ut placeat, peragenda fabula est, modo in quocunque fuerit actu probetur; neque sapientibus usque ad “Plaudite” veniendum est. Breve enim tempus aetatis satis longum est ad bene honesteque vivendum.]

Marcus Tullius Cicero (106-43 BC) Roman orator, statesman, philosopher

De Senectute [Cato Maior; On Old Age], ch. 19 / sec. 70 (19.70) (44 BC) [tr. Cobbold (2012)]
    (Source)

Many older translators refer to the plaudite, which was was the last word of many Latin plays, particularly those of Terence and Plautus. It was basically a formal cue for the audience to applaud. Waiting for the plaudite is the same as waiting for the end of the play, the fall of the curtain.

(Source (Latin)). Alternate translations:

I wolde that ye knowe that as the poete makith not onely by versys of a fable in his comedye callid an enterlude to the intente bycause that it please to hym that pleyeth it in the game. But the poete makith onely his comedye and enterlude to the ende bycause that in every pagent he be preysed and commended of every man aftir his playe. And the wise man also ought not to desire to lyve tylle that he saye "That is to witt I will no lenger of my life." For a short and a litle tyme of age is long for to lyve wele and honestly.
[tr. Worcester/Worcester/Scrope (1481)]

For he that is a stage-player needeth not of necessity to be an actor in the interlude or comedy until the last end thereof (to delight the beholders), but in what act of the same soever he playeth or chanceth to be, he must so expressly handle and play his part, that he may win praise and commendation; neither should a wise man live till the plaudite be stricken up. For a short space and time of life is long enough to live well and honestly, and in whatsoever age we be in, it is sufficient to have lived therein godly and virtuously.
[tr. Newton (1569)]

For a good actor is not applauded in the midst of a Scene, so a wise mans praise comes not till the end. The time of our age is short indeed; but long enough to live well and honestly.
[tr. Austin (1648), ch. 21]

When a good Actor doth his part present,
In ev'ry Act he our attention draws,
That at the last he may find just applause,
So (though but short) yet we must learn the art
Of virtue, on this Stage to act our part;
True wisdome must our actions so direct,
Not only the last Plaudite to expect.
[tr. Denham (1669)]

A short Space of time is long enough, if constantly employed in the Pursuit of Honour and Virtue.
[tr. Hemming (1716)]

And as the Player may be applauded in every Scene, tho' to give true Satisfaction he must finish his Play; so with the wise Man, he lives approv'd by all till his last Plaudit. For the time of Man's life is short, yet it is long enough to live well.
[tr. J. D. (1744)]

No Man expects of any one Actor on the Theatre, that he should perform all the Parts of the Piece himself: One Role only is committed to him, and whatever that be, if he acts it well, he is applauded. In the same Manner, it is not the Part of a wise Man, to desire to be busy in these Scenes to the last Plaudit. A short Term may be long enough to live it well and honourably.
[tr. Logan (1744)]

It is in life as on the stage, where it is not necessary in order to be approved, that the actor's part should continue to the conclusion of the drama; it is sufficient, in whatever scene he shall make his final exit, that he supports the character assigned him with deserved applause. The truth is, a small portion of time is abundantly adequate to the purposes of honour and virtue.
[tr. Melmoth (1773)]

For neither must a play be gone all through by a player, that he may please; it is only needful that he be approved in whatsoever act he shall have been; nor should a wise man live quite to Plaudite. For a short space of time is long enough to live virtuously and honourably.
[Cornish Bros. ed. (1847)]

For neither need the drama be performed entire by the actor, in order to give satisfaction, provided he be approved in whatever act he may be: nor need the wise man live till the plaudite. For the short period of life is long enough for living well and honourably.
[tr. Edmonds (1874)]

In order to give pleasure to the audience, the actor need not finish the play; he may win approval in whatever act he takes part in; nor need the wise man remain on the stage till the closing plaudit. A brief time is long enough to live well and honorably.
[tr. Peabody (1884)]

An actor, in order to earn approval, is not bound to perform the play from beginning to end; let him only satisfy the audience in whatever act he appears. Nor need a wise man go on to the concluding "plaudite." For a short term of life is long enough for living well and honourably.
[tr. Shuckburgh (1895)]

Our span of life is brief, but it is long enough for us to live well and honestly.
[ed. Harbottle (1906)]

Why ev'n the actor to secure applause
Need not play to the end: if but he do
His best, he will be cheered: if wise, he'll stop
Before he reach the final "Plaudite."
A little time's enough, in which to live
A good and honest life.
[tr. Allison (1916)]

The actor, for instance, to please his audience need not appear in every act to the very end; it is enough if he is approved in the parts in which he plays; and so it is not necessary for the wise man to stay on this mortal stage to the last fall of the curtain. For even if the allotted space of life be short, it is long enough in which to live honourably and well.
[tr. Falconer (1923)]

An actor, in order to find favor, does not have to take part all the way through a play; he need only prove himself in any act in which he may appear; similarly the wise and good man does not have to keep going until the curtain is rung down. A brief span of years is quite long enough for living a good and honorable life.
[tr. Copley (1967)]

An actor does not have to appear in the last part of the movie: he can earn good reviews from what he does in any part of it. And neither must life be drawn out until some venerable time for the final curtain. A short time of life is enough to live well and honorably.
[tr. Gerberding (2014)]

During a drama an actor has no need
To be cheered but in the parts he plays
while on the stage of mortal life, indeed,
A man of discernment never stays
Until the last applause. A short life is always
Long enough to be lived honestly and well.
[tr. Bozzi (2015)]

An actor does not need to remain on stage throughout the play. It is enough that he appears in the appropriate acts. Likewise, a wise man need not stay on the stage of this world until the audience applauds at the end. The time allotted to our lives may be short, but it is long enough to live honestly and decently.
[tr. Freeman (2016)]