I'm reading The Fermented Man by Derek Dillinger. The author talks about his reaction towards sugary sweets after one year of eating very simply. It turns out the average amount of sugar most Americans put in their coffee tastes awfully sweet to him. Then he says:
I rediscovered the crash you feel from a sugar rush, an hour or two afterward, when you get nothing more substantial in your stomach. Coffee and a doughnut do not a good morning make, come eleven a.m. or so.
I’m very confused about the time references here, especially “come eleven a.m. or so”. What comes eleven a.m. or so? This part seems so fragmental and lacks its subject that I don’t know how to read it.
Is he saying something like… he had his breakfast (coffee and a doughnut) around nine a.m. and had sugar crash an hour or two afterward, which is around eleven a.m. ?