In other forums, others have filled up with 5 qts. I think some is also taken up by the oil filter.

For question related to the the 2003+ Accord ... try this website.
http://www.driveaccord.net/forums/forumdisplay.php?f=15

This post is related to oil fill-up in the Accord
http://www.driveaccord.net/forums/showthread.php?t=7942

When removing the oil filter, try putting a ziploc bag over the filter, so when you remove it hopefully it will drain into the bag.