Is keep us posted a rejection?

Usually treat it as inactive unless the investor names a specific milestone they want to see and agrees to a future check-in.

How long should I wait for a VC to reply?

After a real meeting, send a short follow-up and one useful reminder. If there is still no motion, keep fundraising elsewhere.

Yes, if the milestone changes materially. But later interest should come from new proof, not repeated checking in.

Learn the practical signs a VC is not interested: no next step, vague feedback, no diligence, no partner pull-in, and slow or generic follow-up.