Solves the airport wifi time limit problem. Don't forget to `sudo chmod +x resetmacaddress.sh`.

resetmacaddress.sh

#!/bin/sh

# Getting interface name
interface=en0
read -p "Interface please (default en0): " otherinterface
[ -n "$otherinterface" ] && interface=$otherinterface

# Generating new MAC adderess
newmac=$(openssl rand -hex 6 | sed 's/\(..\)/\1:/g; s/.$//')

# Resetting MAC address. Asking for permissions
echo "We need sudo access to reset network interface 🔑"
sudo ifconfig $interface ether $newmac

# Checking if changes hold
result=$(ifconfig $interface | grep ether | sed -E 's/^[[:space:]]+ether[[:space:]]//g')

# Output
if [ $newmac = $result ]
then
  echo "Set MAC address on $interface to $result ✅"
  exit 0
else
  echo "Failed to reset MAC address on $interface ❌"
  exit 1
fi