I think the 1 min delay is for time between pictures after it has been triggered by something. Did you set it up for multiple pictures taken? If so, that is likely what is happening. If you set it up for 5 multi-pics, it will take 5 pics, 1 min apart after it has detected something in front of it. then it should stop taking pics until the next time something triggers it.

Is that the issue or is it taking pictures non stop for an hour? If so then there might be an issue.
Hope that helps..