It has been determined through studies that on Mondays at the Sydney international airport, international passengers follow this arrival protocol:

1. Firstly they are checked by an airport officer that processes, in mean 6 passengers per hour. 1 in every 10 arrive with everything in perfect conditions, in which case they are released for the final check. The rest proceeds to the 2nd station.

2. The 2nd station verifies forms. 12 passengers per hour can be processed. Of these, 1 in every 5 are released for the final check and the rest proceeds to the 3rd station.

3. The third station then checks passports at a rate of 20 passengers per hour. All the passengers then proceed to the final check.

4. The final check verifies all the paperwork again at a rate of 60 passengers per hour. Only 1 in every 100 has problems and if this happens they must return to the 1st counter. The rest are then released to take an Uber.

You are a Uber driver that arrives at the airport exit. What is your mean waiting time until being called for a ride?