Sorry, the mp3gain address at hotmail is continually barraged by more and more virus mails that constantly fill the Inbox.
In the "you get what you pay for" department, the filters on free hotmail accounts are woefully pathetic. If there was a simple message-size filter, the problem would be solved.
As it is, I think I'm going to be forced to add some sort of subject line filter and require that all messages have "mp3gain" in the subject or something like that. I'll still probably get spam, since the user name is also mp3gain, but it should cut out a lot of the viruses.
But enough of my e-mail woes

Your request for "estimated time to completion" has been duly noted. It's been on my "To Do" list for a while, in fact.
It's a little tricky to give an accurate ETC. There are quicker ways to get a rough ETC (such as your suggestion of using file sizes to estimate how much work is left), but I just haven't done anything about it yet.
So, um, it's still on the "To Do" list. No guarantees on how long it will take to get to it, though. Sorry.
-Glen