I think this is like asking, "how long is a piece of string", so going to be hard to answer. What did your doctor say?
It depends on so many factors, some of which you haven't set out and some of which you couldn't possibly know - how many days overdue you are, when you'd go into labour naturally if you waited, why you had CS last time, why are you being induced.
As an example - one of my friends went in for induction at 40+10 - they broke her waters, gave no drugs and baby was born 6 hours later.
However my SIL had those pessary things two nights in a row at 40+14 and it didn't help and needed further medication to get it going, and baby not born for another 48 hours from first induction.
However, doesn't seem to be any downside of trying - if it doesn't work, you are not any worse off than if you didn't try and if it does work thats good?