The normal duration of I.Sc. Physics practical period in Indian
colleges are 100 minutes. Express this period in microcenturies. 1 microcentury = 10-6 × 100 years. How many microcenturies did you sleep yesterday?
1 microcentury = 10-6 × 100 years
= 10-4 years
= 10-4 × 365 days
= 10-4 × 365 × 24 × 60 minutes
= 52.56 minutes(approx.)
52.56 minutes = 1 micro century
1 minute = 
micro century
So by unitary method
100 minutes would be equal to
100 minutes = 
microcentury = 1.902 microcenturies.
The practical period lasts for 1.9 microcenturies.
On an average, a person sleeps for 8 hrs
8 hrs. = 8 × 60 mins
= 480 mins
Again applying unitary method,
480 minutes = 
microcenturies = 9.13 microcenturies
Roughly a person sleeps for 9.13 microcenturies.
1