>>772925Japanese businesses and TV programming use an extended 30h-day (to prevent confusions). After 24 it goes until 30 (6 am)
25 1am
26 2am
27 3am
28 4am
29 5am
30 6am
I use it to speak about hours when I haven't gone to sleep yet. If I woke up at 4am I would say 5am and not 29