Hmmmmm, the old AddTime seems to be the only free one. You have to hunt it down, then get the missing dll from an XP system. I searched so many sites I don't even remember where I got it from. The author's download site is dead.
If you can format a column of numbers and copy it to the clipboard with a column cut & paste capable editor, then you can paste and get the total time. Only bad thing is it doesn't support colon ':' as separator which is used on AllMusic. You have to substitute '.' for ':' in the selected text, then copy to clipboard.
Or if you're good on the number pad, just enter the times in and hit the + key for the track times.