Are you referring to Scheduled Reports? Or dataset updates?

Scheduled Reports can be sent daily, weekly or monthly.

Standard datasets (connectors) can be updated as often as every 15 minutes.

Federated data or dataset views are an exception and the data is updated in real-time.

Lastly, you could have duplicate datasets that run in alternating 15 minute schedules and then de-duplicate in a dataflow. This would lead to data updates every 7-8 minutes.