Approximately one hour in Engpsh can be expressed as "roughly an hour."
The phrase "roughly" means "approximately" or "about," and "an hour" refers to 60 minutes.
Examples in Engpsh:
I'll be back in roughly an hour.
It takes roughly an hour to get to the airport by car.
Translation to Chinese:
我大约一小时后回来。
开车去机场大约需要一小时。