If the order gets marked as completed, still the buyer has 10 days to review the delivery so it adds up to a total f 13 days. Even the 13 days are not enough? It means that sellers would not get payments even 17 days after completing the job!! That's a long period of wait so I don't think that If I am a business then I can wait this long period of time to get my funds and use them to run my operations. It makes things very slow. Perhaps that is why fiverr is full of new sellers and experts don't work here.
