I'm guessing either 80, or 100.
I also suggest that you do not spend those Exclusive Fragments past Level 15 unless you have a good enough character to use for a long time whom you can build to be strong over time (should at the very least be an Ultimate Battle Power-UBP character).
You ought to consult someone on your choice also (when the time comes and you have accumulated enough Vitality points to get a UBP character worthy of the investment).