Working on pc requeres some eye resting breaks. Officially it should be every hour... It is not an issue to vape 10ml or more.. Just set your wattage to higher setting.
i think i go through quite a bit, if i use a zipper or dual twisted coil builds in my dripper i can eat through my 10ml plastic bottle in one day.
When i first started vaping i defiantly used less juice, a 120ml bottle would last me 2 months, now i am lucky if i get one to last a month...