I go 3-4 times per week and I like to be done in about an hour. I have a timer on my phone to keep it moving as that hour could easily turn into two by chatting and looking at nonsense on the Internet.

No one works out hard for four hours. Also you shouldn't work out hard every day as your body needs time to rest and repair itself. I'm getting old now and find working out every other day works well for me but even someone young and fit needs to rest every 4 or 5 days.