it stings for about 20mins, gradually getting less and less. I would describe the sting as less painful than a bee/wasp sting. more like an annoying paper cut sting

but....

after my fingertip had finished stinging, every time i put pressure on my finger it would sting again for about 3-5 mins. go away again until i put pressure on and it would happen again

ANNOYING!!!!

for about 2 hours this went on for as well!

Bare in mind also that i do have to take antihistamines everyday so I do not know if this would have altered the effect of the sting on me. By all means add to this if you are more medically minded than me lol!