Implications of.....keeping the speed up

So let's say I'm inbound to Teterboro from the west, doing 250 kias
below 10,000 in descent. Atc gives me a radar vector, and clears me
to maintain 4000 feet.

1, Do I need to slow to 200 kias at some time?

2. I'm considering that I may well be less than 3000 feet AGL (or is
2500 the magic number?). Does this have any bearing?

3. Do I need to worry about being underneath a class B, and thus have
a 200 kias speed limit? Or does atc somehow take care of this for me.

Thanks for all inputs. Stan