There is probably some individual variation, but I’ve been able to see gains on a 1x/week schedule of max strength. The gains were slower than training 2x/week, but there was still progression. Lately my max strength has plateaued, but I think that that’s because of other more intense endurance training that is interfering.
To see if 1x/week works for you, be sure to keep track of the reps and loads that you do each workout. In general, if I had a successful session and completed what I had planned on with good form throughout, then I would increase the next session by ~10 pounds.
I hope that helps.