And even longer on iPad, but these will only be useful when they can deal with ESC key. Vim without ESC is like Word without mouse.
Esc works perfectly on Hacker's Keyboard which is just a download away on the Android market.
Some people set it up so that 'jj' (while in insert mode) is equivalent to ESC (or perhaps it was Ctrl-c, I forget). Either way, that would make vim usable with an iOS device's keyboard.