I thourght getting an answer would be simple, just post you a link to their website.
http://www.sahakarifarms.com/home.html
But... nicely designed site, full of info down to the seat capacity of the different areas of the restaurant, but can't find any mention of opening hours or season!
If I could find the info on some other Goan site, I don't think I'd trust it as being up to date or correct.
I'd suggest using the "contact" form on their site and asking them direct.

Thanks Geoff..tried their site and others...but cannot find any info on opening times....