I'd recommend time blocking for apps in small chunks rather than aiming to finish it all in one sitting. This applies to any job application I've ever sent out law or non-law related, but usually after writing answers for just one or two questions, I'm absolutely beat. I've found forcing myself to continue past that point to really significantly affect the quality of my applications. If you'd like to aim to finish one app in four hours maybe consider splitting that four hours across two days in a week, so that you come back to the app with a fresher mind. You'd also need to allocate some time for research. Personally I think it'd be realistic to organise your time by days, i.e Mondays, two hours research, and then Wednesday and Sundays two hours each on actually writing and finalising the app. That way you can organise writing them around any exam prep you want to start doing as well.