The author talked about how his firm had started to think a lot about this and had applied it to the way they behaved at work. It wasn't time that mattered, but it was how much energy or effort one put into things. The time didn't really matter and one could feel free to be with family and home and vacation and other places when the work was done. It wasn't about the time.
I had come to wonder about the true nature of commitment. In fact, it's not about time. It's not about reliability and predictability. Commitment is about depth. it's about effort. It's about passion. It's about wanting to be in a certain place, and not somewhere else. Of course time is involved; it would be naive and illogical to suggest otherwise. But commitment is best measured not by the time one is willing to give up but, more accurately, by the energy one wants to put in, by how present one is.
This relates to the prior posting I'd made on community too. Commitment to friends, family and community might not be about the time. It is more about an intent to be connected, investing energy, caring, etc.
He also talked about being in the moment and perfect moments. Quit dwelling on the past or thinking always about the future. Put your energy (and time) into the moment.
The author was dying of cancer and he wrote the book about his last 100+ days or so. I highly recommend it.