You won't have a FG reading until the bubbling has stopped, so it will be difficult to predict when fermentation is complete.
Upon making my last IPA, I dry hopped on day 10, which was about 2 days after the airlock stopped bubbling.
Just remember, the more attempts you make at "accessing" the beer, the more your risk of contamination increases.
Token Brewing - Clarendon Hills, IL
Irish Rye Ale - Kegged - 6 gals left
IPA - Conditioning
Pineapple IPA - Conditioning
Honey Basil Ale - Fermenting
Russian Roulette - up next
Hromada Pils - up next