Compare results over the two different periods, and then take it from there. Keeps what helps, drop what hinders. It's a matter of balance, the achievement of which will vary somewhat among individuals. This is Nature's rule, not mine. I think I may have overabbreviated my training program.
Individuals can vary considerably.
You need to apply the basic principles of abbreviated training and experiment sensibly to fine-tune them to best suit you. Sure there's a chance of doing too little, just like there's the chance of doing too much. But generally speaking, most bodybuilders and strength trainees train too much AND too often, and thus get nowhere. But swing to the other extreme, and you'll still get nowhere but through a different avenue. Please always keep in mind that most people give too little attention to eating, resting and sleeping WELL every day, and as a result their training will never deliver the goods they want.