The default number of echo requests sent by ping command in Windows is 4. This can be changed to any number required.
Here is how :
Open command prompt and type :
ping -n 7 sitename.com
The above will ping a site 7 times. In order to ping a site continuously, use the -t parameter as :
ping -t sitename.com
This will keep pinging a site unless interrupted using Ctrl-C. This can be extremely useful in testing stability of an internet connection or a specific server.
Cheers.