Let's do the arithmetic:
1 round = 6 seconds
10 rounds = 60 seconds = 1 turn
6 turns = 360 seconds = 1 hour
24 hours = 8640 seconds = 1 day
This is not, however, how scripts and spells measure time. Spells that are supposed to last 24 hours, like Invisibility, find 7200 seconds in a day. And scripts, if you give them the timer duration TWELVE_HOURS, send you ahead not by 4320 seconds but, apparently, by a shorter measure again. Spelling out in digits what should be twelve hours, AdvanceTime(4320), transports the party not by 12 hours but by 15. What is this about?