Quantum Realm went on to be something they speak about which no one cares in the first Ant-Man movie to something which brings half of the world population back in Endgame. Benedict is a famous personality and on his birthday, there are a lot of things which need to be disclosed in favor of him, as an honor to the great personality for the tremendous work that he has been doing…. The OG Wasp might be on to something. Chronopolis was located in Limbo, the pocket dimension that exists outside of time. She did spend 30 years in there and unlike Scott, she aged inside the realm, so until we get any proper explanation on that, we clearly have no theory in that area. Inside, Chronopolis contained access points to all the different time periods Kang had conquered in the Marvel universe. But we can travel through something called the Quantum Realm.