3 Hours a day = 2 hours and 30 minutes of Runescape, 15 minutes of lag, and 15 minutes of Pornhub.com
I'd say go for it. 3 hours a day can work in your behalf so long as you have an agenda for each day - don't log on blindly not knowing what to do, figure out what you're going to accomplish within those 3 hours and shoot for it.