Which large profile?
The kit is basically a box of wood and a few laser cut ribs. The directions have no illustrations so you end up thinking through alot of the steps. The plans are pretty good. It will take you longer than say a laser cut .40 size plane. They do not frame in your lap and there is alot more to cover.
My friend and I built these as a joint project. We absolutely RACED through these kits even though they were kind of a bite. He framed one over about four days and I covered in four. Then we did the second one. The kits arrived in February and we had them up & flying in March.
I would guess framing at 20 hours and covering about the same. Add four or five more to mount stuff and get it rigged.
-Cheech