That seems unreasonably slow. I had this error message come up when I was downloading CD but I started downloading another app and everything eventually came through:
I have 1Gbps up/down fiber and it probably took 20 minutes to download and install all the 365 apps, so it seems like heavy demand is really slowing down CL's servers.
I'd try canceling the downloads, reboot your computer then try again. The temporary downloads should be resumed where they left off.