dose small bearings spin longer

dose small bearings spin longer ???

yes and no. they spin longer if you are only doing a sleeper, but if you are doing tricks that require more than one stirng layer, they make a smaller gap so the string rubs the response more slowing it down

But I find small bearings to be smoother.

Yes they do. The sleep time record was set with a D size bearing.

I thought the most recent sleeping record was set with an A size bearing… Maybe I missed something.