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I use this trick a lot. I tend to vary between 10-20 minutes though.

I also usually give them a starting point.

"Hey I'm in the middle of something. I can chat in 15 minutes or so. In the meantime if you haven't yet, try X, Y, Z"

This helps push them to at least try something so when I ask later "Did you try X Y or Z?" They can have some kind of answer.

I found this in a non-development role, this lady would constantly phone me for 'help' and I found that if I just ignored her (in a nice way) she'd fix it herself in a few minutes.

brilliant idea. i will use this