Morris Dovey writes:
Artemus wrote:
Am I missing something? I reread the OP's post and couldn't find
any mention of a single pass.
Maybe he just wants to make mortises that are deeper than 2"

You may be right. He seemed to make the point that he couldn't find a
cutting edge length longer than 2", and I interpreted that as meaning
that he wanted a cutting edge length at least as long as the tenon...

Perhaps I misinterpreted.

The OP may want a spiral bit with a bearing (I'm told they exist) for
template routing 10/4 stock. My neighbor just asked after such a
beast - he's a HS teacher and the shop teacher recommended he use on
instead of the normal two-flute cutters.

scott