If he pays what he gets through daily profit with 65 BTC it will take that long as you said gise87 but if he keeps the profit and reinvests it every day he will be able to pay all back in 6 months. The best thing he can do is reopen a secure btc-arbs page accept new investments and hold the legacy funds for 6 months at most and he will be able to pay everyone back in less that 6 months. I would do that. Is the fastest way to fix this problem. I offered BTC-Arbs my collaboration with some ideas but he never replied. He could get together with other people doing efficient arbitrage and with people with experience doing secure web pages and make that happen. I am not sure which are the real intentions behind all these.
If he has 65 BTC, he will need to gather 379 for the people currently listed (444-65=379)
With 0,65BTC per day, he will need 583 days to gather the 379BTC.
583 days = 1,59 years
The time to refund everyone can decrease dramatically depending on how many coins he actually has.
If he has:
100BTC = 1,44 yrs
200BTC = 1,02 yrs
300BTC = 0,6 yrs
But, without real figures we can only guess how long it will take