I stayed in S.P. in "98 for 8 months I went to the immmingration office on the island every 30 days to have my passport stamped, it was above the police station back then, after 6 months I left, and went to Chetumal for 48 hours , I had no trouble reentering Belize.
I am planning on coming to S.P. again in June to stay 6 months-12 months, I plan to do it the same way this time. I haven't read or been told I can't.
See you there.