Though sometimes it's a little early or a little late, your mail almost always arrives around 10:30 every morning. As it getscloser to 10:30, you tend to check the mailbox more often. This is an everyday example of a variable-interval schedule of reinforcement.

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Quizplus · Accepted Answer

This is an example of a variable-interval schedule of reinforcement because the reinforcement (in this case, the arrival of the mail) occurs at varying intervals of time but consistently around the same time frame, which leads to an increase in behavior (in this case, checking the mailbox) as the expected time of reinforcement approaches.

Though Sometimes It's a Little Early or a Little Late