Best time to list is when most people are all home together, and stats show that is a Sunday evening around dinner time.
I tend to list just prior to dinner at around 4.30 or at around 7.30pm, just after dinner. I choose those times to try and hit when all the ducks are in a line.
Most of the family would be at home by 4.30, but you don't want tom wait to prime time on the tube to get in the way of someone's memory.........TV will usually win : )
I suggest you end before or after dinner, but never at 6.00. Chances are that is pretty much spot on dinner, and that will hurt you.
For multiple items, I suggest listing at 1 or 2 minutes apart. If you have the same customer wanting to buy two or more of your items, ending them at the same time is making it hard for them, but ending them close is making it easy for them.
Always think what will make it easier for a customer to buy my items, hard to go to far wrong from there.