how long it would take to synchronize a bitcoin full node?

I got my raspberry pi 5 set and installed and ran my first full node last week.
I used an HDD to store the full node data.
The speed of synchronizing dropped dramatically. It was about 10% updated after the first day, but then the speed decreased gradually, like 5% the second day and finally less than 1% a day now.
I want to ask you guys, is it normal that the GUI shows there are still 8 weeks to finish?