A training can take from several hours to a whole week.

This training takes from 8 to 40 hours in most states.

This system is available from 24 hours a day, seven days a week.

The working day could range from 10 to 16 hours for six days a week.

This may take from 12 hours to 3 or 4 days.

The visit will take from an hour and a half to three hours.

I wonder what great things have come from such hours.

The trip took from half an hour to 45 minutes.

Games can take anything from half an hour to three or more hours (for a 5-player game).

Fresh from two hours at the office, he talked about that for a while.