Sherk the third was done at the same time as Shrek 2, since they signed the contract for 2 and 3 right after the first one's success.
Plus they don't really count as they are sequels and so most of the design, pitching and finding a team to make it has already been done.
The relevant part would be to know how much time it took for Shrek (the first one) to be created.
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