We weren't going to do it by traditional ways where they had to come for 20 hours (of training).

Some things in this game kept me coming back for 20 hours.

Rest would not come for at least fifteen more hours.

"Last night more than 100 people came for four hours to discuss what programs we should expand."

The school has created eight learning centers, where up to 20 students come for two hours a day, which can be scheduled around jobs.

Get out of here, and don't come back for at least six hours.

A health aide comes for only 16 hours a day.

One 15-year-old was killed, and four other people in the theater were wounded, including one who did not come forward for at least 48 hours.

Neither woman had exercised regularly before; now they come three or four times a week, for at least two hours.

The women come together every Tuesday for two hours of rigorous practice, followed by socializing.