Hello Larry Hulisz,
That depends on many things as the others mention. What do these people do on their off time from seeing you?
Then again, look at the work some people do on a daily basis. Some people do strength training and/or aerobics on the job daily, all day, and look at that, they survive.
The body will adapt to whatever it is put through, to a point, of course.
I would say, yes, it is fine, as long as you keep an eye on them and change the workouts.
Preferably, make the day in the middle an easier workout for a working rest session.