It never ceases to amaze (and humble) me when I look at how much work John Calvin did in his lifetime. Besides all his writing, travel, and other work, here is a report of his preaching efforts:
During the decades of the 1540s and 1550s, Calvin was the senior minister in Geneva. This position, as one would expect, entailed a considerable amount of preaching. Between 1541 and 1564, it has been estimated that Calvin preached no fewer than 4,000 sermons on the Bible. On the Old Testament alone he preached at least 2,000 sermons, and that figure only covers the years 1541 to 1556. Calvin usually preached twice on Sundays, at dawn and at 3.00 p.m.; in the morning service he exposited a New Testament passage, and he tackled the Psalms in the afternoon. One or two mornings a week (6.00 a.m.), he would deliver a sermon on an Old Testament passage.
John D. Currid, Calvin and the Biblical Languages (Fearn, Ross-shire, UK: Christian Focus Publications, 2006), 21-22.
I seriously need to remember this next time I feel the pressure of writing ONE sermon.