True I was thinking of my last conversion, which was a zero flight time rating.
Although with the ATR it wouldn't surprise me if the Sim cost plus hotac etc plus payment for the TRE in Sim plus TRE line training Captain for the first 4 sectors wouldn't be the same as doing 4 circuits in the aircraft anyway.
Anyway your looking at about 40K per pilot converting onto type and it taking at least 3 months to get them released to line. And even then it will take 100 hours of flying after that to be become completely de-restricted for low vis stuff and flying with other inexperienced crew possibly also they will have lower xwind limits as well depending on what the SOP say.