How high? Two joints

In decimal I only count to 9 since I need one finger to tip the others.

12 (i'm american)

Wait urm .. ah.. Uhm. What was it that you asked?

depends on how you count

counting like anyone else: maybe 10
if you were to count in binary: up to 1024 I guess? depends on how flexible your fingers are (which is especially difficult with the ring and middle fingers)

2^10 =1.024

depends on the base i use and on the counting system 🥴

depends on the system! the easiest for without having to think too much is counting to 28. if i use the binary system it's more, but i often misscount then

1024

Depends on what we count as a finger