I experienced the power of this when I was working for myself.
On some days I worked for 16 hours, other days only 3. Some of the best ideas I had was while lying down on the bed and staring point blank at the ceiling.
I'm no stranger to "getting in the zone" but this was some next level stuff.
I wish I could sustain myself that way. One day.
What I love about that is that you have long-term goals but it doesn't matter how you get there in the short term. So you can work like a horse for 4 days and rest for the remainder of the week. Or maybe another week you work a little bit 7 days a week.
You don't have to charge by the hour. You could charge by the day, week, month, or project.
With a consulting engagement there's usually a higher expectation of consistent proportional value delivered. It's more transactional (we pay $X we get Y).
As a salaried employee at least in many companies there's some element of the employee being a long-term asset to the company so the pressure is not as high or as consistent.
uhm, well i would put it at more like 33% sales and marketing, 33% R&D&O, and 33% other stuff like HR/finance/administration/etc.
and 1% glamour and glory like going out to drinks to celebrate after a release/sale/hire/investment/acquisition.
sales should not be 80% of the effort, unless you are literally a reseller.