Ads not running

So, I'm trying to run ADs for a client (and it's their first time), is it normal to take a while until you see any impressions?

I created the campaign in October 23rd, and we already on 28th, and there's like 6 impressions, frequency 1.00, cost $0.00. The audience is based on their Instagram, and it's in ready state and the estimated audience size is higher than 10k users. I tried to reach out the support and they said it can take anywhere between 48h to a week, has anyone experienced this before?

I'm asking because I run ADs for another client, and it's didn't run into anything like this before.