There are no rules in Shiduchim. Part 6
by Devora Krasnianski, founder of Adai Ad Institute
How much time might one take to do research?
However much time you think it will be, be upfront with the shadchan. “This is a very busy week for me. It might take me 10 days to get back to you. I will get back to you by Monday the Xth the latest.” If you do not specify how long you think it might take, most will assume one week is sufficient time.
And get back to them by that time. Even if you determine that it is not shayach, don’t leave them hanging. It’s simply not menchlich.