Hi there Smokinr33, just read all of this thread with interest, great little micro grow you've got going on there! From such small plants you actually seem to be doing quite well yield wise!
Couple of cents to throw into the hat here, as always I hope to be corrected by experts if I'm wrong....
You were asking about roughly how long you might have left to flower. I think you figured it out already that you need to be checking trichomes, but it sounds to me like you haven't yet got yourself a decent microscope to check them under. Try one with about 100x magnification.
As far as a guesswork estimate goes, it looks to me to be sativa dominant, and sativas typically have longer flowering times. It totally depends on the genetics, environment etc, but if you wanted a real rough guess then what, 10 weeks or more? But ofc, check the trichs....
Tackling the smell, carbon filter is the way to go if it's a real issue, if less so you've got the right idea with orange peel. Ona works really well. I have an ona block downstairs in my house for if I've just smoked a bowl and there's a knock at the door. I open up the ona block and run round like an idiot for a minute before I open the door, wafting the block about. It doesn't smell particularly nice, but then, if the plan is to cover up the really nice smell of ganja, it stands to reason to use something unpleasant!
Good work on the grow my friend, keep up the good work, I'll be watching this with interest!
I add the left over fruit peelings myself to my compost box for the sugars needed for flowering 