Infinite/Countless Timelines In Dragon Ball
“Because Mira interfered with history everywhere he went, the resulting myriad of time paradoxes was putting a strain on the limited capacity of the entire universe.”
Keyword – “Myriad”
https://en.oxforddictionaries.com/definition/myriad
Myriad means ten thousand. But, generally it’s used as countless, Innumerable, or infinite. (Pretty much an indefinite amount of something). Meaning there are most likely a countless and/or Innumerable amount of alternate timelines within the Dragon Ball Multiverse.
The whole translated guidebook is here:
http://www.kanzenshuu.com/forum/viewtopic.php?f=8&t=24479
Essentially, Mira fucking around with history created a countless number of timelines and time paradoxes that were straining the entire universe and would have made it eventually collapse.
Now onto Dragon Ball Xenoverse 2:
Akoya: “Arg…The more you learn about history, the more you realize you don’t know…There’s no end to it! This’s giving me a headache!”
Hakkyo: “History can end up taking an infinite number of paths. Eventually, you lose track of what the correct version is supposed to be.”
Akoya states that there is no end to history, this in itself could be taken as hyperbole. However. Afterwards, Hakkyo states that history can end up taking an infinite number of paths. Each one of these paths would result in an alternate timeline where said event actually would happen.
Once again, even in other parts of Dragon Ball as well, the idea of there being a “countless” number of alternate timelines is also showcased.
Trunks states that many different “futures” (Timelines) are created from the most simplest of actions, using Goku’s death as an example of this:
Theoretically the same thing can be used for even more basic things, for example a universe where an atom moves and one where that same atom doesn’t move. Or a universe where Goku dies in one second, one where he dies in a month, one where it happens in a year, etc. The possibilities are quite literally, infinite.
Pilaf also states there are tons of worlds[Timelines] in Dragon Ball Super.
illmaticking 