Please try asking the employee responsible.

I exercise at the gym for two hours every day.

What do you call 'time' in dialect?

I've been waiting for hours at that shop, but the meal still hasn't come out.

Have you checked the timetable for the new semester?

That unsolved problem keeps him awake at night.

That unsolved case keeps him awake at night.

The process of name resolution is very important in computer networks.

I know this is sudden, but could you arrange a time for me to meet the president?

The expansion of this problem should be limited.