After having worked so hard in office all five days a week, you would get two days off in which one day you might spend taking rest or else sorting out some of the regular maintenance things that you do for the appliances you have at home or for the vehicle you drive. There would definitely be many things that you should manage during the weekend. Since you could not get distracted from office work during the week days you would postpone all the not so urgent tasks to the weekend. Then why do you want to add the task of removing weeds to the weekend and make the situation even worse.
Do not get too busy that you do not find the difference between the weekdays and weekends. One best solution you could think about is to buy the weed killer that kills everything irrespective of the type of weed you have. If you have not studied agricultural science then it is tough to know the type of soil you have in your lawn and then know the type of weeds that are likely to grow in this type of soil. So, than to buy multiple products, each intended to kill a different type of weed it is always better to buy one common weed killer that would kill everything that seems to be a waste in your lawn.
Now, your weekends would be truly free and could spend some time with your partner or with your family than to engage them in cleaning the lawn. Of course, you could also avoid opinion differences on working in lawn every week without having left with any time to share things that happened during the week days. You could even plan for some short weekend trips that could let you energize for the next coming week.