[More or less as sent. Some people would call this playing with fire. They may have a point.]

C,

I have given more thought to the matter since we last discussed it, and I have identified several reasons why I have historically arrived at work closer to 10am than 9am. In case it should be possible to negotiate an official 10-6 workday, here are my justifications for that schedule.

First of all, a 10am arrival immensely improves my commute—when bicycling to work, a ride beginning at 9am as opposed to 8am involves significantly less traffic (and hence a much reduced risk of sudden death, as well as a faster total ride time, with associated health benefits resulting from the maintenance of an elevated heart rate). During the winter months, 9am has the additional benefit of being at least 5 degrees warmer than 8am.

When commuting via the subway, leaving at 9am rather than 8am involves a much lower risk of being forced to impersonate a sardine en route (the benefit, apart from the higher oxygen concentration, being the increased possibility of simultaneous reading and riding, and associated improvements in mental acuity and knowledge base).

Secondly, years of experience working with my brain has taught me that it functions most effectively in the hours of late afternoon, and least effectively in the hours of early morning (research supports this [1], [2]). Working 9-5 thus prevents me from utilizing precious hours during which my brain is operating at its best.

I hope that these arguments are at least somewhat convincing.

Thanks,

Sam

[1] Robert Westa, Kelly J. Murphya, Maria L. Armilioa, Fergus I. M. Craika and Donald T. Stussa, ‘Effects of Time of Day on Age Differences in Working Memory

[2] Hans P. A. Van Dongen, Ph.D., David F. Dinges, Ph.D., ‘Circadian Rhythms in Fatigue, Alertness and Performance