You can add trash until the compartment is full and the compactor will not compact the trash any further. The compact cycle time will be shortened as the compartment fills up. During full cycle the ram travels 2/3 of the way down into the trash bucket.
With Humalog's short action time of 3  hours, covering postmeal highs with more insulin can be considered as soon as two hours if a meal dose have been underestimated. Of course, not as much sliding scale insulin would be needed here as before a meal, because some of the meal dose is yet to work.
In addition, Humalog and Novolog leave your body faster so you don't have residual insulin causing low blood sugars in the late afternoon or, even worse, in the middle of the night. For most meals, fast insulins will be lowering the blood sugar at the same time the food is raising it. The rise in the blood sugar seen in the couple of hours after eating is much lower, especially with Novolog, and by the end of three hours the blood sugar is often back to its starting point.