In the suttas, the night is broken up into three watches that can be devoted to practice. For example:
AN8.20:1.4: “Sir, the night is getting late. It is the first watch of the night, and the Saṅgha has been sitting long.
AN8.20:1.5: Please, sir, may the Buddha recite the monastic code to the mendicants.”
From the above, one may infer that a watch is quite some time and that monks consistently meditated extensively. But it's not a Spartan marathon where one drops dead after gasping out the news of a victory. Indeed, in DN34, we have:
DN34:1.2.5: What one thing should be developed?
DN34:1.2.6: Mindfulness of the body that is full of pleasure.
So the monks meditated consistently and happily throughout the night, taking good breaks now and then. Personally, I tend to nod off at night, and therefore choose an earlier time to meditate mindfully.
AN7.61:2.1: “Are you nodding off, Moggallāna? Are you nodding off?”
AN7.61:2.2: “Yes, sir.”
AN7.61:2.3: “So, Moggallāna, don’t focus on or cultivate the perception that you were meditating on when you fell drowsy.
Meditating consistently at the proper time tends to favor longer meditations. If we are pressed for time, that can be difficult.