I build factories that build cars.
From coiled sheet metal to loading on a trailer takes quite a lot of time.
Stamping out the panels, transferring them to body, loading the welding cells, etc.
E-coating the chassis and body takes a long time.
Painting and curing the paint takes time.
Coming out of paint there is time for perfecting the paint.
Frames are usually inverted and suspension, brake lines, etc added.
Simultaneously, the doors are trimmed out, body is being trimmed out.
Engine,driveline is mated to the chassis
Body gets mated to the chassis
Radiator and fluids, brakes charged and bled.
Seats and interior comes in during final trim.
Glass gets installed
THEN YOU START CHECKING SYSTEMS.
When I had a Jeep XJ built (walked the line to see it created)it took almost an entire day between paint and engine start up.
So I would say more than two days for a grenadier. It’s low volume, there are other models being made in that plant simultaneously, early cars have a lot of hand fitting, and supply lines are probably not perfect yet.