We recommend starting level 2 with a time interval of 10 seconds. You can think of the time interval as fine tuning the difficulty up or down. As long as your pup is not losing interest, consider increasing the time interval by 5 seconds every 2-3 play sessions. If your dog is losing interest, stress yawning, or barking a lot at the toy, consider decreasing the time interval.
The time interval feature is an important part of fine tuning the right level of difficulty and slowing your dog's ability to earn rewards. Once your dog is proficient at a time interval of 30-40 seconds, consider making the time interval random. Dogs are very good at detecting time patterns, so making the time interval random is a great way to introduce a different kind of difficulty that builds concentration and patience.