As I said above 60 mins refers to the time the hops are boiled. By saying 'only 60 mins' Bribie means he would only add hops for bittering (requiring a longer boil), not for flavour or aroma. The longer hops are boiled for (within reason) the more bitterness is extracted. Shorter boils extract flavour and aroma compounds but less bittering.
If you are doing a boil (generally not done with kits but can be) you wait till the wort comes to the boil. You should boil it for 15 minutes uncovered, then add the first lot of hops (bittering). Boil in total for 60 minutes. You can add hops at any point along the way and depending on what point that is, it will provide a different characteristic.