Agreed, it looks flawed to me. The assumption being that the transmission rate is constant this will obviously lead to longer sentences = more transmission. If

Agreed, it looks flawed to me. The assumption being that the transmission rate is constant this will obviously lead to longer sentences = more transmission. If a %age of your time is spent on each person you know then there will obviously be a maximum point for the likelihood of infection. Then the modellers have to choose an infection rate, this they took from the data. The whole model is begging the question.