how long till search bot checks again?

[editordude]

If I block a certain search bot using robots.txt, how long would it be before they check my rules again?

I ask as I want to save a bit of bandwith ( it's running low ) and would like to know if when I then allow the bot .. how long It'll be untill the bot acts in the normal manner again?

Cheers

[Dijkgraaf]

I think you are the only one that can determine that by looking at how often the bot in question requests your robots.txt file
How often a bot visits a site various greatly, so nobody else would be able to give you an answer.