As with most applications, it could be a lot smaller. But storage is so cheap and abundant that size is no longer really a constraint. Consequently, engineering for size is no longer a priority.
It's either OK internet with caps or vDSL that doesn't really work
I'm in the UK I pay for 100/10 I get 200/20 and I have zero bandwidth caps.
If someone lives behind a 1 Mbps home connetion, then yes, about 1 week.