Although it is not necessary, I always do a step mash with my Helles, a Beta rest at 149 degrees F for 15 minutes, ramp the temperature up to 156 degrees and do an Alpha rest for 30 minutes, then ramp up the temp to 168 degrees for a mash out With the ramp times during the step mash rests, the total mash time is an hour.
I have done bot aa dingle infusion and a step mash on this beer and seem to prefer the body and flavor more with a step mash, YMMV.
I do something similar but much less sophisticated and controlled with most all of my brews.
I heat my strike liquor to my α-amylase rest temp in the kettle then underlet the MLT. Because the grain is room temp, this usually lands my mash in the neighborhood of 140°F +/- a few degrees for a β-amylase style rest. This lower temp does a cpl things: it helps reduce/eliminate dough balls and gets me some β-amylase focus.
Then, I set the clock for 1 hr, set the PID SV temp to mash temp, and it begins heating to my saccharification (combined β-amylase and α-amylase rest) — usually ~150-154°F or so. It usually takes 10-15 minutes or so to hit the α temp.
After the hour mash, I set the PID SV to 168°F to heat to mash out, and set the clock for 30 min which is probably overkill. This is when I cap the mash with dark grains if the recipe requires.
This is were 7.5 gal 154°F strike liquor landed after it was added to 6 lb Pale and 1 lb flaked barley today. Right at 140°F-ish:
*Disclaimer*: Any comment I add is simply the way I brew beer. I am not paid or sponsored by anyone. There are certainly other ways that can be equally effective which other brewers may contribute. This is what I’ve found that works for me using my equipment and processes so I offer this for your consideration. YMMV