@NurseDave I had been roasting with the SR500 outside while it was quite cold and it did increase the amount of time needed but only marginally (like a minute) and only seemed to impact the time it took to get to the first crack phase. I found that weak outlets (I have one on the porch that is weak, don't know why but it is) so that one makes it take much longer to get a roast done. Same with a long extension cord I used in the back yard, the plug is solid but the length of the cord reduced the power to the unit enough to add 5-8 minutes to the whole roast. If you have another plug in the garage or outside you can try you might give it a go and see if that changes things.
I like kyles idea of shooting for a burnt bean so you can better understand the progression. On the other hand, a lighter roast as you have shown may be just what you and your wife end up enjoying most. The lighter roasts tend to have more acidic flavors and a lot of brightness as compared to the same bean burnt to
@HandleBarberDave roast level (herby called HBD roast). What matters is whether you find enjoyment in the final product.
Here's how my time table looks
set the unit to the max 9.9 minutes and turn on low heat high fan for a few seconds (until the beans fluff and bounce) so the beans are moving when you hit the heat.
switch to high and let the bad boy run for 3 minutes. Right around 3 minutes you will hear first crack.
shortly after that first crack I open the top lid slightly to let some of the chaff blow out. some beans have so much chaff blow off all at once it can clog the top enough to reduce air flow.
about 3-4 minutes later (if left on high) the lighter pop or sizzle sound starts. I usually try to get to this stage and either let it run a little longer on medium or low heat or keep it on high for 10-20 seconds then start cooling.
I also found I can set it to medium heat from the beginning and by the time it runs out of time i have a med to med/dark roast.