How long after a flea bites does it start to itch?

I wasn't sure if I should categorize this query here or in Biology or below Gardening. oh well.

Answers:
Depends on how hurried your body react to it. If your immune system is honest, it would be around 45 min (you shall know when you feel the backache!:))

it depends, usually about 1-3 hrs.

The flea doesn't itch at adjectives.