Well, that's not as important now, with relevancy. You won't disappear that fast. But if you're concerned about getting lost in the categories, I'd space them out.
When I have a lot of new items to list, I sit down all at one time and make all of my listings, then save them as drafts. Then you can choose as many as you'd like to list throughout the day, without actually needing the time to sit down and create listings each time.