Shadowing a CRNA

HI,
I am interested nurse anesthesia. I contacted my local hospital and was granted permission to "shadow" their anesthetist. My question is, how long should I shadow him? I have no idea if I should go once a week, 5 days a week, 1 month, 5 months. I will be the first nurse to shadow an employee and the hospital has given me free reign, but they don't know what is considered "sufficient" either. HELP...........

P.S
Any tips on how to prevent passing out in the OR? From past nursing clinicals, I've found that eating breakfast REALLY helps.

Thanks,
Ursula