Suggested marathon training

I’m planning to run my first marathon in 42 weeks using the suggested training from Garmin. I’ve ran half marathons before but never a full marathon. The watch is currently suggesting I run for 5 out 7 days and I can’t see how that will fit into my life with work and a child!

Is this what I should expect when training for a marathon? Is there a way to ask for training plans that are 3 or 4 running days a week instead of 5? Am I being naive thinking that I can train for a marathon without running 5 days a week?