"To set an interval" means to establish a specific amount of time or space between two events or objects. It is like creating a gap or distance in time or position. Full definition
Half of the households received commercially available test kits at set intervals of one, two, five, and eight months, along with educational materials about reducing dust mites. (sciencedaily.com)
Set an interval timer for 15 rounds of 45 sec work and 15 sec rest. (pumpsandiron.com)
If your baby continues to cry, keep going back into the room at set interval times. (newkidscenter.com)