The wallet is a bit slow, but three days is crazy
It should take no longer than 1/2 day to a full day depending on your connection speeds
What O/S are you running the wallet on?
Win7 x64, i7-6800k, SSD, 100 Mbps connection, 15 peers, wallet v0.8.7.5 (v0.2.1).
No rigs, ccminer is reporting 250MHs using just one nvidia 1050ti card lol

Using linux, compiled from source. Moved the nvidia on another coin now, I wont bother with this weirdness...
A GTX 1070 does 1.3 Mh/s so there's an issue with your miner. Or maybe your card crashed.
Weird, I had zero issues on linux other than slightly slower than I would like
Your system specs are more than sufficient to run any wallet with ease
If you have a linux box around you might want to give it a shot just to see if you get better results. You should be able to copy the chain over to windows if you desire once it finishes on linux
We might be able to narrow it down to something in the windows wallet build