Remember, Fiverr is a value and convenience oriented market place. A fast delivery time is crucial to the competitiveness of your gig, but it can also create challenges for your business if you can’t deliver on time.
The biggest source of buyer in-satisfaction on Fiverr is late delivery, which can result in canceled orders and bad reviews. These obviously hurt your business a lot, so you should always make sure to deliver on time.
Therefore, set the fastest delivery time that you can realistically meet for every single order. A good way to do this, is to estimate how long you think it will take you to complete a gig and add one extra day as a buffer.