The study at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3197704/ concludes (emphasize mine):
We suggest that instead of a single, large protein-rich meal, ingestion of multiple moderate-sized servings of [...] protein-rich foods over the course of a day may represent an effective means of optimizing the potential for muscle growth [...].
Question: How much time should I leave between two "servings" of whey isolate?
Calculation tells me that 5 or more servings are best for me (muscle gain, 75kg, 186cm). Problem: I only eat 3 meals per day, and for various reasons I can't eat nor drink anything but company-provided water during business hours (10am-12pm, 2pm-9pm). In other words, my only free time is like 1.5 hours in the morning, 1.5 hours at lunch, 3 hours in the evening. I am afraid that 1.5 hours between two servings would be too short and would equal a single large serving, ie mostly wasted.