well....
for shprt little things i use about 2-5, but the more and more i type the more figners get involve and i end up working around to all of them.
never learned how to 'type'....so i just hit the key i want with whatever is close to it as my hands float over the keyboard(sometimes they overlap a little).
the main downside is that i have to look at the keyboard as i type, but i usualy find all the typos as i make themand can edit on the fly with out looking(spelling errors is another story).