I will repeat on here what i said over on our West End thread
I did 8 shows a week for years, yes it can be a strain on the voice and after remaing with a show for a long time it can become a little too much, but thats the job!
Doctors can work over 20 hrs a day, having to save lives etc, performers do a few hrs a night.
Most performers will feel strain on their voices in to a long run, but its the off stage (how you take care of your voices that count)
It all comes down to training as well, when someone like Connie who won a reality show walks in to a west end show and proclaims 'i can do 8 shows a week' well she should know what you are getting yourself in to.
I think most performers who start from the bottom up (ensemble work) get to train their voices and their bodies that way, your stamina grows with every show
Of course some shows are more vocally demanding and sometimes you are going to have to call out sick, but most times performers just get on with it.
I performed through flu, broken fingers, broken toe, sore throat etc, but you get through it. If its to much you take a persoanl day and thats fine
People like Connie however had lengthy amounts of time off due to her going in to the west end in a lead role, through a reality show, without having built up her stamina first.
I think if perfomers get the chance to have an alternate then they will take it (they would be stupid not too) but most time that 3 hrs a night is really not that bad
Namo i love u but we get it already....you don't like Madonna