Resignation

I sent my resignation last week. As per the offer letter, I am supposed to serve an 8 week notice period. As such the 8 week notice period itself is long period. But as per feedback/email from HR and my manager (who soon will be ex-manager), I should return to India and resign (that's the new policy of the employer). I am not sure when should my notice period start? On the date when I resigned, or the date I land up in India or the date I resign in India.

There are two bad parts:

• There has been a series of events that have lead me to resign (not sure if anyone is really interested in it yet).
• The treatment that company is offering after 4 years of dedicated service, is just out-of-the world.

I hope to pass this phase in next one week and start all over again.