I recently had a client place a large order that needed extra time to complete successfully. Because of the way my Gig is set up, Fiverr only gave me 5 days to complete it.
I contacted Fiverr support and asked for more time to be added. They promptly responded and gave me direct instructions on how to request more time from the buyer. Within minutes I was able to add a few more days to the delivery date and get it approved.
Thank you, Fiverr, for the awesome support!