Whole House Fumigation for pest control is normally done between one and 7 days, as noted by the State of California. While I could not find something related to Residential Fumigation by the New Mexico state government, the state has a very tight licensing and control of pesticides for environmental and health/safety reasons. Fumigation times depends on the pesticides used, but for the most part,the up to a week is average throughout the country. Spot inspections of a fumigation site is not unknown (much like building or fire inspections, both scheduled and random), so while 2 weeks may be okay, anything more is pushing it, for both the Fumigators and the Meth lab. People start getting nosey eventually.
So 2 weeks time frame to set up, cook, and break down, without getting caught. Walt and Jesse were planning this, so it's not a spur of the moment thing. In S05E03 "Hazard Pay" Walt and Jesse go along with Saul to find a front to cook in. Walt is very precise about the failures of the other fronts. They would know what they need, and have it ready. They bought the front company, and gave the employees strict "Don't steal from these houses" rules. All the equipment was chosen for this.
As you can see, it's not a lot of equipment. Most of it is self-contained with little external piping from one to another. Most of it is on wheels or carts. To me, that shows the lab is setup in such a way that it requires the least amount of connections to setup or break down. Odd ball, I say the setup only takes a couple of hours at most. As they are doing this about once a week, at random houses, they would not want something complicated that would take days to test before cooking.
While not explicitly shown, given Walter's attention to detail, the time preparing for this, and the danger of screwing up, it's more than likely that Walt had tested and designed the equipment before the first cook. The equipment is designed and simplified for the task at hand.