run wget in parallel

#!/usr/bin/env bash

## The time (in minutes) the script will run for. Change 10
## to whatever you want.
end=$(date -d "10 minutes" +%s);

## Run until the desired time has passed.
while [ $(date +%s) -lt "$end" ]; do
    ## Launch a new wget process if there are
    ## less than 70 running. This assumes there
    ## are no other active wget processes.
    if [ $(pgrep -c wget) -lt 70 ]; then
        wget http://www.betaservice.domain.host.com/web/hasChanged?ver=0 2>/dev/null &
    fi
done