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.
2 doctors agreed: Short acting insulin: such as Humalog, (insulin lispro) generally begins lowering your blood sugar with 15 minutes of an injection. Its peak action is between 30 minutes - 1.5 hours. It may still be having an effect on blood sugar for as long as 6 - 8 hours after an injection. ...Read more.