The Planning Fallacy: ”How much time will this take” becomes something like ”How much time did it take for me to get this far, and many times should that be multiplied to get to completion.”
More like “how much stuff I have left to do divided by how much did I do today”; even ”How much time did it take for me to get this far, and many times should that be multiplied to get to completion” wouldn’t be that bad, because that would mean I take in account the time I have procrastinated (or have been hindered) thus far and expect to procrastinate (or be hindered) for roughly the same fraction of the time.
More like “how much stuff I have left to do divided by how much did I do today”; even ”How much time did it take for me to get this far, and many times should that be multiplied to get to completion” wouldn’t be that bad, because that would mean I take in account the time I have procrastinated (or have been hindered) thus far and expect to procrastinate (or be hindered) for roughly the same fraction of the time.