Hi Mary-Grace,
maybe build up 6 smart campaigns which filters for people who clicked on a link and in the flow you look for a custom field, if it's no you send out the mail, if it's yes you don't send out a mail and after sending the mail you set the field to yes.
In an other smart campaign you look for field changes and after x days you set it to no again.
Hope that's clear and that works beause I have no idea what happens when they click 2 link in 10 seconds.
Best regards
Steffen