Another thing to keep in mind is that longer flight times sound great in theory but aren't always so in practice.
If this is your first plane you may have fallen into a trap many new flyers fall into, that of thinking that 10 minutes flight times are too short.
In reality 10 minutes is plenty and you'll find yourself landing in much less time than that.
Unless you're flying a glider you won't need more than 10 minutes per flight. When you are just learning your nerves will thank you for the shorter flight times.
It takes a great deal of concentration to fly well in the beginning and keeping that level of concentration for longer than 10 minutes can wear you out, leading to mistakes that could signal the very sudden end of your aircraft.