Related: How does the day/night cycle work?
I have started a mission which has an optional "complete at night" objective. However, I'm afraid to pursue it just now because it is already night and I don't know how many in-game hours (real-world minutes, according to the linked thread) are left before dawn. I don't want the night to pass away while I'm in the middle of completing the objective and therefore lose the bonus.
Is there a globally-accessible means of telling what time it is, with a reasonable amount of precision, in-game? I know the clock in Lynchwood give some indication, but to travel there (and especially to fast-travel) would take some time and really throw off my plans.
NOTE: Though I would not be surprised to find out that there is a cheat/debug command that will retrieve this information, I'm needing something (if it exists) that will work for consoles. I'm on PS3.