Your post is not very clear. Since you are selling online, your shop is open 24/7 - not specific hours.
I have tried several times to enter the address in the contact page settings but it always doesn't appear
Dashoard>finances>payment settings>address - that's where you change your address.
I am not sure what you are posting. I don't see this anyplace on Etsy for this information.
I'm not sure what "doesn't ALWAYS appear" means. Does it sometimes appear?
It sounds like you already know this, but here's Help:
Also, you could try posting in this team, in case others have had the same issue:
https://community.etsy.com/t5/Pattern-Users-Support-Group/bd-p/PatternUsersSupportGroup
I just went to your website and I'm not seeing hours on your Contact page. But I do see the address.