Which way do people really use to check lien? Will a boat seller be
willing to wait two weeks for the title to be cleared?

I sent that link because it's the official way. For what it's worth, I've
never come across a lien in NJ. In this state, they aren't very common.
I would suggest making a stop at DMV and ask them. Any further advice I
can give could be very wrong. ;-)

Seem like there is no easy answer. OK, I will stop by DMV to see if
they know anything about this.

Thanks.

Jay Chan