5 - for now...
It's also not necessarily a final position, either. The data so far accumulated gives sufficient confidence to go to 5, further data may (or may not) give confidence to go beyond that.
The "As a result, NASA has determined they are comfortable with up to a five-time reuse for both the Falcon 9 and the Crew Dragon capsule," is very very different to the sub-headline of "NASA urged to reuse Musk hardware no more than five times"
Poor editing, el reg.