If the offending word had a w in front, then the answer would be as many as they can get.
The 900 hours limit has been around for ages. There is now little or no science to justify it, but the effort required to change it means that no-one really tries that hard.
1200 hours would be acceptable to science, but the issue is not around the number - the potential "risk" is all in the scheduling. "Good" schedules would allow rest, recovery etc. Poor schedules are a risk to both pilots and customers.