Anyone want to know how much Reapers there are?
Assuming each cycle produces a maximum of 1 Sovereign class and 3 destroyer class (this limit is arbitrarily placed), there may be upwards of 20,000 Sovereign class Reapers and 60,000 destroyers.
Of course, if each cycle produces more than one Sovereign, then that number could balloon even more. Basically there are enough Reapers to "darken the sky of every world".
We know the Reapers are at
least 1 billion years old, and we know it takes tens of thousands (possibly hundreds of thousands, but was it really hundreds of thousands of humans that went missing during ME2? That seems a bit high) to make about half of a Sovereign class Reaper. So lets be generous and bump it up to 5 million to make a full Reaper, because hey why not. That means harvesting 11 billion Humans on Earth would make 2200 Sovereign class Reapers.
Lets say each cycle only managed to harvest 1 billion species, that means each cycle would produce 200 Sovereign class Reapers, that would mean there's 200 billion Sovereign class Reapers.
We also know that the Destroyers "in astounding numbers, make up the bulk of the Reaper fleet" so lets just times them by 3 like that guy in the quote above me did. That's 600 billion Destroyers.
Edit:
That doesn't count all the Oculus, which I presume are made from the materials from the destroyed ships(?)