Once a download is complete, LimeWire will show 100% in the progress bar and the status doesn't say "Downloading from x.x.x.x", it shows something like "completed".

If your connection is a dial up, download ONLY ONCE SONG AT A TIME, and only download from users with Cable\DSL\T* connection. A download with a 56K modem should take about 20 minutes for a 4MB file. You can also help if you disconnect while downloading (Unless you are connected to 3 ultrapeers, that don't take much bandwidth).

Don't forget that your download speed will be slowest host in the sequence (If your connected is T3 and you're downloading from a modem user, your speed will be no more than the speed of the modem user).