Allow to set weekly or monthly pull requests minimum time

Some repositories like:

1. https://github.com/python/cpython
1. https://github.com/SublimeLinter/SublimeLinter

Are highly active and hourly or daily have new commits being integrated. Then I am constantly notified by pull requests creations or new commits pushes.

Would be useful if I can set a minimum of a week or a month between the pull requests creations for these repositories.