The "wait 10" idea doesn't work in WindowsNT. WAIT is not a command.
However, if you just want to stall to give hosts a break, try this
Use my suggested BAT file (change filenames as desired)
In the TXT file, put your real sites you want to ping and then follow by a zillion instances of your own IP address.
By the time it gets through trying to ping them, some time would have elapsed.