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It looks like there is a defect in the calculation of MAXRT. I raised this issue via a chat, but have not heard back yet. In my case, MAXRT is computed as a negative number which results in runtimes limited to 1 minute. According to the help, MAXRT = (60 * ASA)/(AR-BIR). My application rate, (AR) is less than the infiltration rate (BIR). This causes MAXRT to be negative. That doesn’t make sense, if application rate is lower than infiltration, there won’t be runoff!
So maybe your case is the opposite, AR is greater than BIR.
Perhaps a temporary workaround is to swap the two factors, AR and BIR, to change the sign in the equation.