In article ,
ARW wrote:
2nd year apprentice had the task.

I had already drilled the holes and fitted the red rawl plugs. About a
2m length of dado.

He has access to a screw box and an impact driver (with a proper PZ2 bit
fitted).

So how long?

a full day - and the dado is upside down

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle