@cecilia84 As long as they are still showing in your gallery, you can shop and redeem the offers. Some will disappear quicker than others. And don't always trust a countdown. It may say 8 hours, and be gone 30 minutes later.
@cecilia84 you have until the offer expires. Some offers will be in your gallery for weeks. Some hot offers just get pulled with no countdown clock. You'll want to redeem freebies sooner rather than later.
There is no time frame only time frame there is it's after your purchase you have 7 days to upload your receipt besides that it stays on there until the offer expires which sometimes it can be a week or two other times items can be a couple of months