How much time do we actually have?

Lets calculate the time we have for this Holidays:
24hrsx30days=720hrs

Sleeping:
1 day 9hours
29daysx9hrs=261hrs
720-261=459hrs

Camp and cca:
1 camp of 3 days. CCA twice a week 5 hrs each
3x24=72hrs
5x4=20hrs
459-92=367hrs

Homework:
english
compo-1.50hr
compre- 2hr
grammar package- 1.30hr

maths
4hrs

science
chem- 1.30hr
physics mindmap- 2hrs
online test- 1hr
textbook questions- 1hr

humanities
1 full day 24hrs

total: 38.50hrs
estimated: 39hrs
left: 327hrs

meals
1 meal 1hour
1x30x3= 90hrs
327-90hrs= 237hrs

Those who have Singapore Poly course
5daysx8hrs=40hrs
237-40= 197

Revision
3hrs 1 day
3hrsx22days=66hrs
197-66=131hrs

Therefore we have 131/24= 5days of rest