I'm planning northbound thru hike starting 2/21/23 and want to average 15 miles per day. I'm trying to factor in zero days for resupply, washing clothes, etc. and wanted to know how often most hikers are taking zero days. Is it one per 2 weeks or more? I know unforeseen things will surface but wanted to gauge how long I'll be on the thru hike factoring in the zero days. Thanks!