(EDITED by CM - all capitals)

Think with all the changes and disgruntled players at present, people are strugggling to complete levels as quick as before when they dont want to purchase boosters. so 45 seems an adequate amount, you can always go back and try to get sugar stars on the levels you have passed to keep you going. what i tend to do when no levels left. Got upto level 1000 all with 3 stars only for them to add another target of sugar stars and hitting sugar stars is harder than it looks