What do you mean? Obviously, multicellular life forms did evolve in those several billion years.
When these transitions only took 60 days, why not take another look at the 'several billion years'? Maybe life did form much faster under certain conditions.
Maybe life did form much faster under certain conditions.
You mean multicellular life here, obviously. Yeah, as the experiment shows, it probably did form fast under the right conditions. It's all about genes. If being a part of a multicellular organism allows one cell's genes to spread more rapidly, than that cell is going to have an incentive to be in a group.