That leaves all the rest of the fuel you carry to get you to destination.
Yup. All 17 USG of it.
That's typically about 55 mins after an allowance for take-off and climb.
I've already said I wouldn't swap the Twin Com for anything else. Just bear in mind that as four-plus-bags aircraft, it's very different from what it's capable of as a two-person (3:10 to dest) or even three-person (5:30 to dest) tourer.