As with any renovation project, some upgrades take longer than others. The most time-consuming project in a bathroom remodel is tile work. This can take up to seven full working days, depending on the size of the space, what kind of tile is being installed, and how much tile there is. Most of the steps in the process take one to two days, while things like demolition could take up to five days and waterproofing may take two to four days. Simple upgrades, such as if you choose to replace the vanity, can be done in a matter of hours in most cases.