The universe began at the beginning of the Maha-kalpa. It is only the Maha-kalpa that is used to describe the beginning, middle and, end of a universal cycle. If you want to say ‘Vipassi Buddha’ lived in a previous universe before this one you can only be referring to a universe prior to this one. Something that happened before this one came into being. Forget about the sub-kalpas, they all happen within one universal cycle.
All we need to establish is when this universal cycle began, when this universe began and, then compare that number with circa 51, 000 000 years ago - when Vipassi was (said) to be on this planet - or elsewhere. That big-bang event - the beginning of the universe is a known quantity and, it was more than 51, 000 000 years ago. Therefore, Vipassi was a resident of this self-same universe that we are presently occupying.
Now that has been cleared up, we can ask the question: where in space - specifically - do we place ‘Vipassi Buddha’? Wherever it was it could not have been on Earth - is that clear? It must have been on some other planet that - for reasons unknown - seems to have been a lot like ancient India.
51,000, 000 years ago is an era in prehistory called the ‘eocene’. During that time we know what kinds of animal species and plants lived on the Earth. We know what the composition of the atmosphere was, we know a great deal about it because people have asked questions about the prehistoric past and used powerful research methods to find out the answers. You can be sure, that there could not have been any trace of human civilisation on Earth at the time. Below is an explanation of what was happening on Earth 51,000 000 years ago - is this were Vipassi lived and taught - in a place like the 'Eocene"?
Eocene
The known fossil families of the Eocene Epoch (54.8 million to 33.9 million years ago) include the Tarsiidae (tarsiers), the Adapidae (which include probable ancestors of lemurs and lorises), and the Omomyidae (which include possible ancestors of the monkeys and apes).
The family Adapidae and the related Notharctidae contain two North American genera, Notharctus and Smilodectes, which are well represented in the fossil deposits of the Bridger Basin, Wyoming, U.S., and Adapis, Europolemur, Anchomomys, and Pronycticebus from Europe. Notharctus and Smilodectes are not thought to be antecedent to living lemurs, though Notharctus was not unlike the modern lemurs in size and general appearance. On both morphological and zoogeographical grounds, particularly the structure of the foot bones, the Adapidae may have provided the stem from which the living lemurs and lorises evolved; one genus, Europolemur, is even known to have a had a toilet claw, the large claw that in modern species replaces a nail on the second toe of the foot. Representatives of the Omomyidae have been found in North America, Europe, Egypt, and Asia.
The Eocene Tarsiidae, represented by the European species Necrolemur antiquus, found in the Quercy deposits of France, and Afrotarsius chatrathi, from the Fayum of Egypt, are likely to contain the ancestor of the modern genus Tarsius. The tarsier is indeed a “living fossil” (in the best sense of that overworked term), and teeth referred to the modern genus Tarsius are known from the Eocene Epoch of China and the Miocene Epoch (23 million to 5.3 million years ago) of Thailand.
Traces of what are probably the earliest monkeylike primates (Simiiformes) come from 45-million-year-old deposits in southern China. Eosimias, a tiny fossil known mainly by jaws and a few foot bones, has features that are plausibly argued to be those expected in the earliest ancestors of the Simiiformes. From slightly later, in Burma, come remains of further early simiiforms, Pondaungia and Amphipithecus. These have been known since the 1920s, but it was only in the 1980s and ’90s that further remains were discovered to confirm their simiiform status.