How do know when to follow up with investors after sending your pitch deck?

Hey Ali, if you've pitch in person you are in a good position to followup. Just at the end of the pitch indagate with the investors themself about the next steps by directly asking to them "when can we be in touch again?". This gives you the knowledge about the perfect timing to followup and also gives you the motivation to followup (they've told you to get in touch in that moment). We all are human at the end, if asked with courtesy people usually respond to questions - and if they don't or they are not cordial in the reply, it is a good signal they are not the right investors. In case you've pitch by sending the deck by email on the other and, it's always good in my opinion to be referred from someone they know, so the deck will not slip in the oblivion of the mailbox :) here a useful trick that i've heard of https://www.producthunt.com/disc... disclaimer: i've never met with investors yet as i'm bootstrapping atm, but it is what i would probably do. Hope is useful for your specific situation. Best and cheers! Achille