Many of freelancers says that to get more orders on fiverr at new stage everyone should stay online at least 12 to 15 hours. But besides this I think it is more important to get more orders, you should marketing your gigs in different social media. Because Impression, clicks, views are very important to rank or show your gig in first page. Most of the buyers gives order from first 2 or 3 pages.
I think it will more helpful to rank your gig at first page and get fast order.
If you know other effective way to get more order please share with us in comment.