That brew will be fine,I constantly leave mine in the fermenter much longer than required.If they are off they stink and have growths.
When taking the hydrometer reading yes loosen the lid.You also need to de-gass the beer before taking the reading by tilting the sample back and forward in the sample glass a dozen times.If you dont the gass bubbles in the beer cling to the hydrometer giving you a false reading.
I havent used a hydrometer for years,I just make sure I give the brew plenty of time to finish(usually waiting for keg space)
ENJOY
Andrew


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