A Tuned Piano is a Played Piano
I am very thorough, giving each tuning session approximately 2 hours. To make certain that a piano is as stable as possible it takes multiple passes over all of the strings. That takes time. I also make adjustments and small repairs, vacuum the dust out of the delicate insides of the piano and check the instrument to determine its general condition.
If the piano needs further work, I make sure that you understand the problem, the impact fixing (or not fixing) would have on the instrument and the possible options you have for repair.
I tuned the traditional way, “by ear”, for years. A few years ago I started using piano tuning software on a Pocket PC ensuring that all of my tunings are consistently accurate and stable. I still use my ears during the tuning process to make sure all of the notes are as sweet as can be.