When I run bitcoin core, it says 5 days will be required to sync, is that normal?
Yes, it's normal. Few things that makes sync long :
1. You use HDD which causes bottleneck (applies if you have fast connection)
2. Your internet connection is slow
3. You use very old or barebone PC (such as Raspberry PI) which causes bottleneck on CPU/RAM
5 days? Lol. I'm into my 3rd month since i started syncing, but I'm now only 10 months behind, so in a few weeks it should complete.
One thing i have noticed: the hard disk usage is heavy, think swapfile heavy... I wouldn't recommend using an SSD, they might be fast but they would deteriorate quickly... Perhaps if you have a LOT of ram (16g+) and run a pruned node, a ram disk would be interesting.
I haven't observed a particularly high CPU usage, but ram could indeed be a problem if under 1gb.
Unfortunately i don't use a core wallet, since in my country it would be impossible.
Have you referred to China? I am concerned at all about countries restricted core wallet. Would appreciate if you share some countries. I have tried to learn about it on google but didn't find anything. Can you list some countries here?
List of countries for what, poor
internet speeds?, or
Bitcoin prohibition/draconian regulation? Just look in Wikipedia.