In the USA, this is governed by 14CFR 61.109(a). Basically if you have
18 hours in gliders with at least 8 hours dual, then you can meet the
ASEL requirements with 12 dual and 10 solo hours in a single engine
airplane. In order to complete that fast, you will need to be prepared
for each minute of your lessons. You also will need to pass the FAA
knowledge test for Private Pilot airplane.

Your instructor needs to be as prepared as well. Be sure he has a
syllabus that takes advantage of your experiences. Good luck with your
training.

Terry