Have never seen a laptop with over 32 gig of RAM in it, the top workstation models all max out at 32.
No-one would pick a laptop to do the work that a system with more than 32 gig of RAM would be doing, even if it was possible to do with memory density, the cost vs possible sales would not make sense. Once you get to 32 and over gig of RAM you are looking at multi-CPU servers and super rendering machines that would also need multiple CPUs and large cases for cooling, video cards and RAM slots.