Explore a physics seminar where Luca Delacrétaz from the University of Chicago examines the fundamental bounds on thermalization time in quantum many-body systems. Delve into the investigation of how interacting systems reach thermal equilibrium, focusing on the conjectured Planckian time lower bound of hbar/T. Learn about the use of effective field theory techniques to derive universal corrections to diffusion at intermediate times, and understand how these corrections provide evidence for thermalization bounds. Discover the specific case of conformal field theories (CFTs) where scale invariance helps prove the Planckian bound. Examine applications to spin chains, where universal diffusion corrections enable precise thermalization tests and help identify dissipative universality classes with limited computational resources.