Backstory: I work for a large company and last summer I took a seasonal role. Before taking the role my boss at the time requested four weeks to find a replacement before I moved into the role. The role was the same pay so I wasn't too worried but it was a complete failure where my “transition time” was basically the last three days of that four weeks I ended up training for my new position and training the new person for my old position. The season ended about four weeks ago and I was moved back into my old position. Because of the way the department was funded, there were previously no full time positions and everything was seasonal.
Now, four weeks later, I am moving back into the department for a pay bump and my boss once again wants four weeks (the amount of time I've been in the position) to find and train a replacement. Currently, there are 8 other people in the department with the same job title and responsibilities as me who could handle this.
So wondering how to handle this. I was set up for failure last time and got through but this time it's an actual hit in my wallet to waste this time. I also covered for two different supervisors who left while in the department for two months at a time while a replacement was hired so I know that *someone* can do it. I've been very vocal about not taking on extra unpaid work when it has been offered to me multiple times. I do a great job at my job but I know how taking on extra responsibilities for no pay is a useless exercise. So how do I handle this? Since it's internal, I don't want to come off too harsh but I also want to be in the other department as soon as possible.