It would seem, as Otto and I had discussed on the prior thread, that there are many variables and even different expert opinions with regard to stomach contents and the determination of time of death:
Normal Gastric Emptying Time:
Through radiological study the Mean (average) time for gastric emptying of the stomach (in normal individuals) is 75% at 90 minutes. Complete emptying will occur at 90 minutes in some, and between 90 and 120 minutes in the rest (+ or - t1/2 avg)
http://www.ask.com/answers/79496781/what-is-the-normal-gastric-emptying-time
pp 132-33 Massei
He paid particular attention to the digestive process, preceding his explanations with the following[129]critical remarks:
"the stomach contents represent a concrete problem...because there are so very many variables, above all at moments of stress...the analysis of the stomach contents implies technical knowledge, is physiologically quite difficult, and the results are always open to some doubt..." (page 15, hearing on June 20, 2009).
Professor Introna maintained that in order to apply these criteria, it was necessary to know the values of certain initial parameters:
the time when the last meal began; whether the stomach had any pathological problems which might slow down the digestive processes; whether the stomach was quite full or had already begun to empty itself.
He recalled the data from various testimonies, from which, as he observed, it emerged that
at around 18:00 18:30 pm, Meredith began to eat a homemade pizza with various toppings (cheese, mozzarella, eggplant and perhaps also onions) and then ate apple crumble with ice cream.
This meal ended at about 20:30 pm, so he considered that the mealtime lasted from 18:30 to 20:30 pm.
He recalled the reports by Dr. Lalli and the other experts stating that under macroscopic examination, the stomach contents revealed a piece of apple and floury fragments which might have been from the crumble or from the pizza.
He also recalled that the emptying of the stomach under standard conditions starts around three and a half hours after the start of a meal, say between three and four hours after, and that the term "emptying" indicates the stomach emptying its contents (into the duodenum).
He asserted that "knowing that Meredith's meal started at 18:30 pm, knowing that there were about 500 cc of stomach contents, and knowing from the autopsy that there was no pathology of the stomach...which could slow down digestion, and above all", as reported by Dr. Lalli, knowing that
the duodenum was still empty "because the stomach had not even begun to empty itself" (page 19 of the transcripts), the time of death must lie between 21:30 pm (three hours after 18:30) and 22:30 pm (four hours after 18:30), and that this timing agreed with the less rigid data provided by the analysis of the hypostasis, of the rigor mortis and of the body temperature, considering the uncertainty of the body weight which was guessed without weighing the body.
He also observed 130]that the beginning of the attack must have been a moment of tremendous stress for Kercher and may have arrested the digestive process. One could and should obtain a precise indication from this, in the sense that the stress to which the victim was subjected must have started between 21:30 pm and 22:30 pm