Here is a new study which recommends moderate protein every 3 hours rather than something less frequent.
We conclude that the pattern of ingested protein, and not only the total daily amount, can impact whole-body protein metabolism. Individuals aiming to maximize NB would likely benefit from repeated ingestion of moderate amounts of protein (~20g) at regular intervals (~3h) throughout the day.
Daytime pattern of post-exercise protein intake affects whole-body protein turnover in resistance-trained males
The whole paper is available to read, so it will be interesting to go through it and see what they are really saying.