if [ "$2" -ge 1440 ] ; then
  t="24 or more hours"
elif [ "$2" -ge 120 ] ; then
  t="$(($2/60)) hours"
elif [ "$2" -gt 0 ] ; then
  t="$2 minutes"
else
  t="unknown time"
fi

echo "Welcome $1! You've been away $t." | sendmail sms-email@sms-gateway.address
