How much time is needed to get a spawn from brand new Pokestops?

I live in a rural area, a really bad place to play Pokemon Go.
But recently a random level 40 guy offered to submit some new Pokestops in the nearby (post office, city hall..) and after less than a week I finally have 3 pokestops and a gym.

The only problem is that random Pokemon are not spawning yet. Just one sometimes from the sightings.
How much time do I have to wait to have normal Pokemon spawning?