If done on a daily basis, it will take approximately 15 minutes. It is very important if you maintain the Bichon in show coat to brush them on a daily basis. For a lot of the groomers, it will depend on how many mats they find and how long it takes to get them out. They are very intelligent but Bichons are not always cooperative with housebreaking. Housebreaking can be difficult but not impossible.
Crate training makes it much easier to housebreak the dog.
The main rule to follow is keep the dog confined to the room you are in and give them access, on a regular basis, to the place where you want them to go. Bichons can be paper trained or trained to go outside. Establish a routine and follow it. Bichons can even be trained to go on cue with patience and consistency. Each time they do it where you want it done, praise them, which they love.