Many thanks for your advice gained from experience.
I started Thursday evening after eating at around 5pm, worked 9.5 hours construction Friday and tractor mowed for 5 hours today Saturday starting at daylight, been real busy doing stuff all day.
my energy is still up to normal. Sunday, the last day I will rest and eat as you have suggested around 5pm to be up for work on Monday morning.
Is it counterproductive to be so active while fasting? It's just that I have a lot to do besides playing doctor.