Students may also perform an externship for up to 3 hours of credit.

In this activity he performed for two consecutive hours, working an additional hour due to public acclaim.

Some of the city's stand-up comics will perform for two hours each week.

She performed for two and a half hours long as the crowd sang and danced along with her.

Smoking is performed in a thick smoke of 50-60 for 12-18 hours.

Barry performed a spacewalk for 7 hours and 55 minutes.

Such practices are felt to be essential in building up the stamina to perform for nine hours at a stretch.

While in the US, he performed intense sadhana for 10 hours daily.

Dry heat sterilization can also be performed at 121 C, for at least 16 hours.

Thus they were permitted to perform for three hours in the evening.