FABOOL Laser Mini
It depends on your skill, but normally it takes about 3~5 hours.
(According to test does at our company.)
FABOOL Laser CO2
It depends on skill of users, but it will take at least 15~20 hours.
FABOOL Laser DS
You wouldn't be able to assemble by yourself so please start with 2 to 3 people at least. It depends how if you are familiar to this type of things but normally it takes from like a couple of days to a week.