Apache Reference: http_core, MaxRequestsPerChild
Maximum Number of Requests per Server Child Process
Syntax: MaxRequestsPerChild A
Example: MaxRequestsPerChild 10000
Since: Apache 1.0
This directive sets the maximum number of HTTP requests that an
individual server child process can handle. After this number of
requests is reached, the child process will die. If number
is 0, then the process will never die automatically. For
KeepAlive requests, only the first request counts toward this
limit.