Hi, my first post but this question bothered me at first to.
Only on day four and day three was horrible. I came so close to quitting last night but managed to hang in. I have been having my first shake around 8:15 which was normal breakfast time and my second at around 6:30, normal tea time. However, I was so bad yesterday, I had to mix my shake at 6:00 as I was so hungry it hurt (yep, a big fat bloke but still feels pain lol) Anyway, on day four, I left my morning shake until 12:00, it is Saturday though, and felt fine so this evening, I should not be so desperate.
As said above, it is best to find a rhythm and follow it, although it may change from day to day. Just go with the flow.