It does depending on destination, sector length and acclimatisation etc.
No it doesnt. There is no "local nights" restriction except with regards to days off. Which may of course be taken downroute not at home.
It never requires more than the mimimum rest for the preceding sector. IF it falls in the 18-30hrs rest the max succeeding duty may be reduced below that required, but if that rest was kept below 18hrs the same duty as after 30hrs would be allowable. ie 12 hrs rest gives the same allowable duty as 31.
Can we leave the speculation on CAP371 to those who use it every day please?