Maybe half an hour on a 50 Mbit/s connection, whereby it wouldn't reach the maximum download speed at any time. Don't remember exactly, but it went flawlessly with Opera 39. (The whole folder has a size of roughly 1 GB.)
I have uploaded the XTC files (Install 2.0, Patch to 2.2, 2.2a hotfix + manual for X3TC; experimental X3AP version, 2.2a hotfix and Aldrin_ATF_Rep fix for X3AP) on my mediafire.com account now:
Link.
Since this is the biggest file (the 2.0 main download) I ever uploaded, I have no idea how good or bad the download speed for it is or whether there are any other problems. The download should be resumable though, in case you have a browser which supports this (otherwise use a proper download manager) and as long as your IP address didn't change since you started the download.
Edit: Added X3AP files.