Apache MaxKeepAliveRequests
Monday, July 10th, 2006 - 8:20 pm - Web hosting
The option MaxKeepAliveRequests specifies the number of requests allowed per connection when the KeepAlive on has been set. When the value of this option is set to 0 then unlimited requests are allowed on the server.
For better server performance, it’s recommended to allow unlimited requests or you can always define it with a high value, for example, 10,000.

If you have Solaris as you operating system you should set MaxKeepAliveRequests to 5000..10000 requests, by:
MaxKeepAliveRequests 5000
or
MaxKeepAliveRequests 10000
due to memory leeks.
i think 300 is enought