4+ hours for me. I've got i74770, 100mpbs internet and new SCSI DH.
Dowload 4GB update at 400kb/s
Unpack update
Install update
Delete old files
Download another update
Unpack update
Delete some more files
Download/Install localisation pack
Delete some more files
Download another 1GB update
Current at 50% of latest update, now downloading at 300KB/s
I have lots of Steam and Origin games - never have this crapjust getting a game update. Honestly no idea what Wargaming are doing, but maybe just release your next game via Steam next time, they seem to have this sorted out.