HI
I used the Veet in shower one and thought it was awful! For a start, it didn't stay on in the shower, even when the instructions were followed perfectly, big lumps of it washed off and left the bottom of the bath extra slippery (and quite frightening!)
The bits that did stay put, when removed did not take any hair with them, but seemed to soften them so even when I tried to shave them an hour afterwards the hair wouldn't move!
So not only did the cream not remove the hair, it made me unable to remove it any other way!
In answer to your question, I used to use depilatory creams and I would say 5 days would be a good estimation, if a generous one. I would say expect to see regrowth within about 3 -4 days