I have just started making wine after a break of over 20 years, so have virtually forgotten everything I learnt back then! I have 2 x 7 day wine kits fermenting on a hotplate. The 1st one has been on for 10 days and the airlock is still bubbling but only about once every minute. Is now the time to check with the hydrometer, and if the reading is ok take it off the hotplate?