OP testified today Reeva cooked him chicken strips in a stir fry that night, and he came downstairs from showering and changing (but not ipading!) about 7pm, and they ate until about 8pm. And Reeva made him (but not herself?) a 'warm drink'. OP does not think it possible Reeva could have got up without him noticing!! later, to eat something else.
The pathologist testified Reeva had vegetables and a whitish substance (probably cheese) left in her stomach. As it doesn't look as though the pathologist did establish the whitish food, I guess it could be the stir fry and that could be the chicken. Stir frys contain veg.
But that would mean it took Reeva 7 or 8 hours to not even fully digest that meal. And most importantly, the veg was still there. Not certain, but I think it is veg that digests fastest of all. So even though digestion rates vary a lot, I bet that puts Reeva's digestion rate at an unusually slow rate.