Can i change the App availability multiple times? Can i change the App availability date multiple times?. i.e Making it available for sale and changing it to future, again making it available etc.

Example:
I make an available today, its get on to the sale, people download it and use it.
I realize that there is a use case missed, but to confirm that i need more time, i immediately change the App's available date in Future, may be like 10 days and then test the use case and again make the app available.

If this can be done, i.e making it available and moving it to future, again making it available... Is there a restriction on number of times that you can do it, is there any Apple policy around it?
There doesn't seem to be a limit on how many times you can change an app's availability date. Note that there's a 24–48 hour delay for your change to the availability date to be reflected across every App Store.