func (crnI *CronInstance) nextMin(inc bool) bool {
    fromMin := crnI.min
    crnI.min, _ = next(crnI.crn.minutes, fromMin, inc)
    if crnI.nextH(crnI.min > fromMin || inc && crnI.min == fromMin) {
        crnI.min, _ = next(crnI.crn.minutes, 0, true)