This is from a forum search awhile back so no guarantee on the accuracy
WGT balls durability
1.0. 70-90 hits
1.5. 90-110 hits
2.0. 110-125 hits
2.5. 125-150 hits
non WGT balls
2.0. 100 hits
2.5. 120 hits
numbers do not reflect any putts
The WGT legend ball Gl2SD2 with 1.5 durability got 98 regular hits for me.
The Nike level 48 ball with 2.5 durability got 90 shots for a member according to him. He didn't say if last shot was in the water but was complaining about durability for what it's worth.