Coupon expiry date set based on claim date

[StevenH632]

What do you think about allowing the expiry date of a coupon to be set based on the claim date.

For example, if we want the campaign to run for an indefinite time, but we want the coupons that are claimed to be valid for only 2weeks or a month.

So, the expiry would not be a specific date, but rather something like "2 weeks after claim date".