We have DP610 and DP700 and yes, the first time takes about 10 or 15 minutes.
Downloading with CG150 takes about 8 minutes. (large program)
Downloading via USB-cable (back, not at the front) is about 1 minute, much faster and you can choose "only display" and/or "CAN1 and CAN0 at the same time.
unfortunately it doesn't work now, because of problems of device drivers in Win10, but normally it should work.
Front USV-connector ist a USB host connection, not for connection to pc, only stick. You can't download here.