40, 60, 90, 120, giant (this takes my a little longer due to the size of the parts only), makes little difference in my building times because I do most of the same things to all. I would say that 95% of the time, it takes me longer to complete an ARF than claimed. If I just slapped the thing together, maybe less than claimed, but I definitely don't build that way. Even with quality ARFs, I take extra time sealing covering down, gluing, strengthening in places like gear mounts, refitting, fuel proofing, sealing surface gaps, and in some cases, detailing. This stuff all lasts longer if done when new. I never really saw much point to "estimated" build / assembly times anyway. It is whatever the owner wants to make of it anyway.