The question poses a difficult one, that my Goddess has wondered if me too.
How much isolation time does a male acting as an Alpha in the real world need to decompress and get into the state of mind of being willfully submissive? I know for us, we discovered that just walking in the door from the real world pressures I face (I have a full time job as a construction crew chief) and immediately dropping it sounds good, but just doesn't work that way.
What we do, is about an hour on those days. I as a trans person have a hidden female beauty regimen that I do everyday, regardless of whether we play or not. It's just a cool down period, and I bathe, take care of myself by shaving, exfoliating, moisturizing, and when I come out I put on my bra and panties.
In that time I have the clear space in which to cross over into my sweet, wonderful, and very sexually devious life with my Goddess, knowing that the morning and return to it will come soon enough.
It's just a bit of balance and a crossover point for me. Just give him a bit of time before you pounce on him, girl.
He loves it when you do and just needs a few minutes to come down from all the pratfalls of being Alpha in the workplace. Good luck.
M.