Just when is "Too Much"?

Right at this moment I have 22 yahoo bots crawling my forum, and has been increasing for the past 5 minutes so I don't know when it will reach the max. I couldn't fit them all on my one screenshot.

Every bot has a different IP address.

So I ask, Just when is "Too Much"?

o.o

And one more thing, should I be excited?

 

I would consider it a good thing.

Or would you rather have yahoo not index your site

 

Yahoo loves your site i guess...
Do you rank well there?

 

I had the same thing happen last month to a fricken blog of all things.
3 yahoo ip addresses with hundreds of sub addresses, that were pulling 3g's a piece in bandwidth.
I don't know what it was, and there was no response from Yahoo about it.

 

I get lots of bots from Yahoo on my forum, frequently maxing out database connections.
I tried

User-agent: Slurp
Crawl-delay: 10

Code (markup):

in my robots.txt which seemed to help a bit but it's still an invasion
Max i got was 180+ at the same time :s

Edit:
So far, i had 132846 visits from Slurp this month vs. 95890 from Google.

 

Jeez, I thought 20 was a lot o.o

Anyways, thanks for the replies guys

 

3 yahoo ip addresses with hundreds of sub addresses, that were pulling 3g's a piece in bandwidth.
I don't know what it was, and there was no response from Yahoo about it.

 

I've blocked them.

 

Too much is when they bring your server down