Sorry for being 17 days late but if this helps anyone else here is what I’ve learned.
Yes it is possible. Especially if your firewall settings and hampering it. Also, if your hardrive is not a SSD but the 5 or 7200rpm spinning ones. I did not have the SSD so mine took 3 days.
Yes, you can shut down and it will pick up from where you left off but as transactions happen you will have more % that needs to be DL’d.
Other wallets that work to store as well are Trezor model T and Yoroi. You can even use yoroi with trezor.