Sorry to rain on your parade, but gliding ain't like that. You will be expected to assist with launching, retrieving and possibly winch driving later on - it takes a minimum of 2 other people besides the pilot (preferably 3 or 4) to get one glider airborne, so plan to spend a whole day at the club no matter how much or how little flying you personally do.
People who pitch up, rig their own glider, launch and then f**k off are not popular at most clubs, and get as much assistance as they give.
And 45 minutes is peanuts. I know people who drive more than a hundred miles, stay in the clubhouse / caravan for the weekend then drive home.
So yes, it's a weekend thing!
FBW