I work professionally as a designer, and have done so for over 20 years. I love the fiverr gigs, but one stumbling block I hit time and time again is when I receive an order right before a weekend and it therefore will be late on delivery when a client want extra fast delivery. Or when they just expect me not to have a life and work 24/7 and expect me to respond to emails at 3am.
It would be a helpful feature to be able to show the clients hours of work (Mon-Fri 8-18CET, or Mon, Tue, Thu 12-21 for instance), and the days that I work and it would help them to find a suitable candidate for the work they want done. I think this would help with customer satisfaction.