I used to drink 3-4 mugs of tea in the morning before work, 1 litre mug as well so it was a double bagger. At work I can get through a solid 6-7 mugs on early and night turns, 4-5 on a late turn.
Needless to say its the Yorkshire Tea catering bags to keep the costs down at home, if only they did Gold catering bags, fortunately work have started supplying Yorkshire as well rather than PG, vile stuff.
Love my tea and love PG!
Couldn't drink as much as you; my bladder couldn't take it at my age!