You can submit a membership hold request for up to 60 days [long hold] one time throughout the year or up to 14 days [short hold] twice throughout the year. You can do that with the Hold Request Form below.
Don't forget that, if you will be gone for a short period of time, and only missing a couple classes, you can make-up some or all of those classes during the next week. That likely will make a one-week hold unnecessary for you.
Please note that these holds cannot be split up and used cumulatively later on. For example, requesting a 30 day hold will use your one-time long hold and a 10 day hold will use one of your two available short holds.
Holds cannot be applied retroactively.