If your weekends a impossible for you to get in the long run, make it any day. Just keep the above 3 elements of a schedule in mind. Once you have written a schedule, stick to it. It should be a contract with yourself. Be flexible to a point.
All successful plans have changes.
Read your body for signs of pain and fatigue. Injury and sickness force many a runner off the roads for a month when just a day off or two might have been the answer. Don't make up missed days. Continue from where you left off. Call me for help in revising your schedule.