As for an instructor's point of view,
Doing the complete nightrating in one night, might not be the best idea.
Besides the fact that it will be alot of new experiences for you, there will be groundschool involved, as well as a nav-trip, for which you have to prepare.
And most likely you will have to get some fuel, there is not a lot of planes that carry 5 hours endurance plus reserves.
All in all, there will be alot more time involved, then the already required 5 hours. I'd try to atleast split it up in two days.
-IBLB-