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.
Take the insulin 1/2 hour before you eat. Humalog is taken 15 minutes before a meal. This is a way to manage sugars before you eat and 2 hours after you eat. normally, you check your sugar right before you eat which determines the sliding scale dose you will use. Always check your sugars after eating and at bedtime.