Job Guilt Problem

[2planka]

I've been with my current firm for 4 years. The boss who hired me retired, new guy came in, and effectively squashed any advancement opportunity I have for the foreseeable future (he brought in one of his cronies for the role above me). I've been on a few interviews and am quite close to accepting a new position with another firm.

I get to work at 7:00 this morning and the boss is already here (he never arrives before 8:00). He takes me aside and hands me a large bonus check (unheard of at this firm unless you're a VP, which I am not). He says that I have been identified as one of the key contributors, blah, blah, and the board authorized the bonus for only a handful of employees.

My recruiter just called to tell me an offer letter from the new company is being fedexed to my house today.

So my question is, how long should I wait after depositing the bonus check to give my notice?