How long does a FET last?

I'm curious about the duration of a FET. Could you tell me, how long does a FET typically last? Is it a procedure that takes just a few hours, or does it extend into days? I'm interested in understanding the timeline involved, from start to finish. Also, are there any factors that can affect the length of a FET, such as individual health conditions or the complexity of the procedure? It would be helpful to have a clearer understanding of this aspect of fertility treatment.