I am flying Toronto- Brussels- Delhi by Jet airways and have an open jaw return: Chennai-Delhi-Brussels-Toronto, all in Business class.

I am asking for help with a few questions

1. My arrival time at Delhi on the MAA-DEL flight is 8:30PM, the Brussels-Toronto flight leaves at 2:40AM. Can I enter the International terminal right after getting off the MAA-DEL flight? I read somewhere (on these forums) that passengers are allowed in only 3 hours before, does that apply to transit passengers as well?
2. Would my bags be checked through to YYZ at MAA?
3. Any ideas how to kill time at DEL?