At my current workplace it took at-least 6 months of 2 engineer efforts. That’s about 200k of sunk cost + the opportunity cost of them working elsewhere. Plus

At my current workplace it took at-least 6 months of 2 engineer efforts. That’s about 200k of sunk cost + the opportunity cost of them working elsewhere. Plus other people who got pulled in, it’s easily about 300k to migrate from oy2 -> py3. We still have a mumbo jumbo mess of py2 scripts lying around.