Silly question of the day here.
Considering the simplicity of the beginery songs listed here, and the shear number of songs there are to learn, and assuming the practice time is available, is it better to spend 3 minutes a day on 5 or 6 different songs, or 15 minutes a day on 2 or 3 songs?
I think where you need to be heading is to make progress that you can measure on at least a weekly basis, note down in a book what you can manage (how many chord changes per minute and what chords they are, etc.) together with the date. 2 x 15 minutes per day seems to be the best for me, 30 mins in one go is maybe a bit much although that seems to be the minimum time most teachers list for lessons. I find I often don't make any progress in 15 mins so I come back later and have another go, it's unusual not to make some headway each day or two.
3 minutes in a session I feel is too short, you won't make steady progress as it can take longer to do a brief revisit of yesterdays work. I am at that early stage where somethings are slow and tedious and I don't seem able to make headway with them, so I leave it for another day and have a go at something else rather than stalling and not making progress. Recently I've done minor chord practice, chord changes to a metronome, playing scales to a metronome, strumming/rhythm, plus trying to tease around 4 "strummed" tunes to sound correct. I also keep going with "Apache" by The Shadows, it initially seems hard but has some easy parts and after only 3 weeks from scratch I can play it from beginning to end, admittedly with a few stumbles, but through a practice amp with an echo effects pedal it sounds good and reminds me why I am learning.