I have to remove my airlock to get a temperature probe out of the carboy. I can probably do this in 15-30 seconds. I understand that air shouldn't touch the alcohol, but will this short of a time period hurt? I'm at day 4 of fermentation.
Additionally, I recall a worker at the LHBS state that he removes the airlock and adds yeast nutrients at day 3 of the brew.
(The temperature probe I bought did not have tinned wire ends, so I can't stick them in my breadboard. I didn't realize this until after I brewed. The company I purchased them from said I could get a refund for them. It cost me $10 and I could sacrifice it if taking the airlock off at all is bad).