24 hours

there are 24 hours in a day.

i usually sleep 6 hours or less.

and i stay in lab. from 8:30 to 19:30 or more.

i practice for 1 or 2 hours.

and i sometimes read books for 1 hour or more.

but,

there are still 4 hours remain.

what how am i spending these time?

i'm wondering about it...