Is it normal for it to take hours to delete a Time Capsule "sparsebundle" I'm trying to make room on my time capsule to make backups (it currently tells me it's full).  

I got help in this question with how to delete individual backups, but it didn't solve the problem.   Even after I'd deleted all the backups Time Machine sees, I still have a ~700GB sparsebundle on the time capsule.

So, I'm trying to manually delete it, but it doesn't appear to be making progress.  I had this for about an hour:



and then it switched to this:



I realize that might seem like progress, but note the lack of blue filling up the progress bar.  It's been like that for hours now.

Is this normal?  Is there a better way?

Note that I really don't want to reformat the TC because I have other files that I've manually saved there, plus my wife's TC backups.

EDIT: Nothing was happening.  It was apparently too much for Wifi.  Once I connected via ethernet, I was able to delete, but it took the better part of a day.
It is theoretically possible if the drive is near full that a delete operation may take a lot of time. You can try to delete the file via the command line, which bypasses the Finder and does it the Unix way. 

In any case there must be hard drive activity during the process. If the drive is not making any noise or light, then it’s not doing anything and that’s not good. But be patient.