How can something be "finished" with dummy lyrics or generic music? Genuinely confused. :)

When you say "studio time", do you mean "recording an idea that's (nearly) ready", or "polishing writing and recording an idea that's nowhere near ready"? Because I'm talking about the ideation, before I even start recording. :) NB You may be on the right track - time management has always been an issue for me, even with regard to practicing guitar, but I'm making progress on that front.