1. No its not the strongest in terms of THC, the only reason its "stronger" is cuz you get a whole lotta smoke cuz of all the weed burnt.
I say in terms of THC the last hit would be strongest, cuz it has a lot of resin and other things caught on.
2. A bit less than a gram.
3. A few bowls maybe.. depending on the weed and the size of the bowl. Like with strong stuff, i usually just have a bowl.