You can add an expiry date onto your Quotes. The expiry date is automatically added onto a quote, but this article explains how to remove it, set a default expiry time, or enter a custom one.
Entering a default expiry time
In My Account, select 'Edit Account'
Here, you can enter the default expiry time.
Entering a custom expiry date
You may also enter a custom expiry on any individual quote. When creating the quote, simply edit the expiry date.
Removing expiry date altogether
To remove an expiry daate altogether, you need to edit the quote template. Here, simply check 'Hide expiry date'