I'm getting single digits from Finland:

    $ ping 1.1.1.1
    PING 1.1.1.1 (1.1.1.1): 56 data bytes
    64 bytes from 1.1.1.1: icmp_seq=0 ttl=58 time=3.766 ms
    64 bytes from 1.1.1.1: icmp_seq=1 ttl=58 time=4.120 ms
    64 bytes from 1.1.1.1: icmp_seq=2 ttl=58 time=4.636 ms
    64 bytes from 1.1.1.1: icmp_seq=3 ttl=58 time=3.587 ms
    64 bytes from 1.1.1.1: icmp_seq=4 ttl=58 time=5.370 ms
    64 bytes from 1.1.1.1: icmp_seq=5 ttl=58 time=3.286 ms
    64 bytes from 1.1.1.1: icmp_seq=6 ttl=58 time=4.084 ms
    64 bytes from 1.1.1.1: icmp_seq=7 ttl=58 time=3.766 ms
    64 bytes from 1.1.1.1: icmp_seq=8 ttl=58 time=3.548 ms
    64 bytes from 1.1.1.1: icmp_seq=9 ttl=58 time=6.760 ms
    64 bytes from 1.1.1.1: icmp_seq=10 ttl=58 time=3.667 ms
    ^C
    --- 1.1.1.1 ping statistics ---
    11 packets transmitted, 11 packets received, 0.0% packet loss
    round-trip min/avg/max/stddev = 3.286/4.235/6.760/0.973 ms

And this is on wifi.

I have ~2.2 ms to 1.1.1.1 on RDS, wired as well. I guess it depends on the area and how lucky you are with the equipment they use.

Frankly 10 ms is good enough.