I’d heard it many times before, and have many times since, and it is very true that there is never enough time to see EVERYTHING in this location. I made the mistake on my first time of being there, to stay almost a whole day forcing myself to see everything I could, but only ended up burning myself out. It is my recommendation before you go to look at their website (http://www.thebritishmuseum.ac.uk/) and get an idea of which exhibits you would like to see before you go. If you have all the time in the world, go and visit in daily hourly doses. I found that I absorbed more as well as it being a highly enjoyable experience. I am excited to be returning in just a week or so.