I managed to stay in for 4 weeks when mine got them. The only exceptions we're taking them for a drive in the car, and to the Doctors (I phoned in advance, had my mum wait with them in the car until they were signed in and the separate waiting room unlocked for them to wait in in isolation)
First one got it mild (covered in spots but not ill), still ended up on antibiotics for infected spots.
My 7 (at the time) month old sported a 39.5 fever that wouldn't break for days, didn't sleep a wink, and ended up having to change to stronger antibiotics after 3 days of flucloxacillin, as his infection wasn't budging (skin and concerns about his chest)
My 5 year old stepson was the illest I have ever seen him, he was whimpering and crying for help in his sleep. He also ended up on antibiotics.
And I was meticulous and I mean meticulous on hygiene to try and prevent any infections.
For those reading, please do not assume that pox is a mild childhood illness. Mine were all poorly, there are people on this forum that have lost children due to chickenpox.
I'd have been absolutely devastated if I'd have purposefully exposed my children to it.