>>4740685 (lb)

Little to do w/ QR but I still dare try:

>why is 'time' in base 60?

probably historic. 60 has the most/diverse divisors. Easiest to handle without too much difficulties & still a large enough number.

www.thoughtco.com/why-we-still-use-babylonian-mathematics-116679

en.wikipedia.org/wiki/Sexagesimal

>why 360 degrees in a circle?

similar reason, and also time & a circle are connected via Earth's rotation. Like angles can be measured in minutes/seconds as well. But there's also gons for example (400 in a circle).