By the time you get your licence & are allowed to fly round your mums house by yourself you will have learned how long it will take, course to set, fuel reqd & how much it will cost etc.
Or an accomodating instructor will demonstrate all that for you on your first air experience flight.
Overloading the brain at the early stages is a waste of time, it gets easier once you have learned how to fly & land the thing.
Once you start training you will be up to your arse in approach speeds, when to flare, downwind checks etc. The nav bit comes later.
However, as said, 90 knots (Cessna 152) 30 nm = 20 mins. If you are going & returning in the same wind conditions then the time will work out as about 90 knots total, ie: 60 knots going, 120 coming back, or near enough. Experts will correct that no doubt.