Help on scheduling push notifications

Hi All,

I have a question about OneSignal:-

I have a body movement website and want to send a reminder to my clients to get up, maybe a “push” notification (or some sort of notification that come up on the front screen) who are working on their computers. 

I would like this to happen every 90 minutes from when they log on the website (so each user will have a different time for the notification.

Any ideas welcome.

 

Thanks,