I get about a week out of them chain vaping. I think they get less disgustng than others when they go bad, so I probably use them a day or so longer than others might. Depends what you can stand.
i have used 30/70 in them and when i get a good coil it can last 7-12 days or to put it another way 30 ml or more. by good coil i mean one that does not jump from its initial resistance when priming say .41 -.42 if it jumps to .43 then its about 2 days max with the same juice.