I don’t think you do that much with the IP to nation module other than band users and show flags 😊 You could try using the IP2nation flags tag to see if you can get it to output other data such as times but you then have the problem of all the time variations around the world, eg in the UK we have different times in the summer and winter (+/- 1 hour) so you’d need to take that into account.
You could do it with javascript, but again you’d probably end up using the users local time on their device, and if that’s out so will your open/close times.
If it were me I’d skip the clever way and provide open/close times in simple text format for each country/region/timezone.