I am Interested In Knowing

Obviously, there are two categories of wet shavers; those who face lather and those who bowl lather.  I believe everyone has tried both methods before settling on one.  And, like myself I used one method and then changed.  I currently bowl lather.  So, the following questions are directed to bowl lathers.  There are several different types of soaps and creams and the all have various idiosyncrasies.  

The main question is approximately how long do you normally take to make a lather to your liking in a bowl?  Do your times vary based on the soap (such as hard soap, soft soap, tallow soap vegan soap)?  Do your times vary based on the brush you use (assuming you have more than one brush)?

There is no right answer I’m merely curious or maybe even nosey.

A couple of minutes approx. across the spectrum when I do bowl lather which I only do with samples and really soft "croaps" e.g., Chiseled Face.

For me the time of lathering depends on both the soap or cream and the brush. Some soaps are "thirstier," requiring more water, and since I add water a hand-sprinkle at a time, they take longer to build the lather. And some of my brushes, although nearly all are Rooney badgers, just seem to whip up the lather faster and more easily than others.

For me, it depends more on the soap/cream than which brush, though that can affect the result.  I never think about it and just stop building a lather when I get what I like so really have no concept of time, whether with the soap or the brush.  If it's a hard soap, I almost invariably bloom the puck.  If it's a softer soap like my latest acquisition (Hendrix Classics & Co. Barbershop) then I just wet the brush but don't bloom the soap.

For me, it depends more on the soap/cream than which brush, though that can affect the result.  I never think about it and just stop building a lather when I get what I like so really have no concept of time, whether with the soap or the brush.  If it's a hard soap, I almost invariably bloom the puck.  If it's a softer soap like my latest acquisition (Hendrix Classics & Co. Barbershop) then I just wet the brush but don't bloom the soap.

Very good I forgot to add "Do you Bloom". Thank you Freddy

A couple of minutes approx. across the spectrum when I do bowl lather which I only do with samples and really soft "croaps" e.g., Chiseled Face.

Makes sense as samples are general small in size.

As long as it takes to make my lather to my liking, I don't time it. I just enjoy it.
Yes times do vary based on all the factors you mention.
They also vary based on the brush.
I usually start with an almost dry brush and increase the moisture as I see fit.
My house is heated by hot air so the humidity, which varies with the weather, also can determine the time.

I am not fond of face lathering. I wonder if, with all that rubbing and scrubbing, it does not cause more facial problems and misery, because of all that friction, than does the bowl.

1-2 minutes for me, I usually start a little dry and add water until the lather looks like a good meringue, shiny and no or tiny bubbles.

Cheers, Steve

The actual shaving mug or bowl makes a difference. I use bowls that have no finish and ridges or other irregular surfaces. That makes quick work of it.

I usually spend 3-4 minutes depending on how wet my brush is when I load the soap. I think creams lather faster, but I don’t time it, it just seems faster.