I have a 10 hour layover at CCU in a couple of days and I'm hoping there is some decent place to spend the time.

I'm arriving at 3:50 pm via S2 domestic. I'm departing on a 9W international flight at 1:30 am.

The flights are booked together, so I assume my baggage will be transferred?

I'm guessing I need to change terminals?

I can't find any information on transit hotel facilities (I don't really need to sleep anyway). Any chance to pay into a decent lounge?

Other suggestions how/where to spend the time?

I've been to Kolkata before so I don't feel like I need to run around and sightsee for a couple of hours, but if leaving the airport is the best option, I'll probably leave.