Strip out, rewire lighting/sockets/oven/etc, new extractor ducting/hole, new ceiling, new sink/waste location, plastering, sand/refinish floor, painting, fit kitchen.
There's quite a bit of work before the actual kitchen fitting as it's a new layout and everything is wrong at the moment!
Yeah what they doing in this 41 days, our pal does a kitchen in about 5 days himself strip to finish depending what is involved.