Well im In no rush so timings are only based on what others have told me and shown me and the results are great . I know one charcuterie who can smoke bacon / duck breasts etc within 2 hours using an old commercial smoker that recycles the smoke it generates and the results are great . Another butchery that use to smoke my meat for me use to put it in the smoker at 5pm and at 7am the next day it was a lovely golden colour and smoked right thru and they are using a home made smoker that has a automatic turning screw that feeds course oak sawdust onto a hot plate .
I'm just trying to emulate what I've seen but it's just not working for me perhaps I'm missing something ..?
In that case, why ask the question? The simple answer is to get those experts to smoke your products: that would make commercial sense.
We are talking about cold smoking here aren't we? That's what your original post said.
I suggest that you look to any source of information about 'traditional' cold smoking and you'll not see times of 2 hours, or even smoking for just one night. I've no doubt that commercial smokers can achieve this - Torry smokers etc, but that requires a considerable investment.
However,
I know that brilliant products are made commercially using the method I suggested, and at little cost. I know that we have members here who use this method to produce 'high-end' products to sell.
Hopefully, one of them will come along soon to point you in the right direction.
At the end of the day, I guess it depends whether you're after quality or mediocrity!