What is the Time measuring, building the lather in the bowl?In my experience, the worse my lather looks, the better it performs. Only the 0.1mm film between your skin and the razor is relevant to the shave. If the lather were 20cm thick, would it improve your shave? Nope. Lather is bubbles, bubbles are air, and air is not a particularly effective lubricant. The thinner the lather, the better the ratio of water to air, and the slicker the lather is.
The only time thick lather has any utility is if a shaving pass takes you several minutes, because the layer of foam keeps the thin, slick film on your skin from dehydrating. Some folks take 15 minutes for a single shaving pass, (new straight razor shavers for example), and thin uber-slick lather dries out before they've even done their side-burns. The downside to thick "yogurt like" lather is that it isn't as slick, the upside is it maintains a reasonable level of slickness for a very long time. Lather is always a trade-off between slickness & longevity, and is best determined by the how long a single shaving pass takes for you.
Here is a helpful chart from the Academy of Tonsorial Science to illustrate the trade-off between slickness and time. Put succinctly, "if you want it slick, you've got to be quick".
That's my 2 cents anyway. YMMV.