One can argue that the S/BMR ratio is fundamentally different from a ratio involving all boating activities versus BMR (boat maintenance and repair). I like #34 above (Newport Bob) b/c that's more or less what I do depending on how I intend to most use the boat in the coming season or over the next few weeks, etc. For example, there are dings to be buffed out or patched, the anemometer at the mast head is not turning, the binnacle compass is short of oil, there's a small leak in one of the engine's cooling hoses, fwd head needs the joker valve replaced, & etc. But my last four "big" projects were: 1) Rewire the windlass remote switch (Quick); 2) Install 4 new 6-volt deep-cycle batteries; 3) Install a battery monitor and a second 85-watt solar panel; & 4) Make up a new 5/8" chain snubber. Why?--going cruising!! So, 12 days (11 nights) away from the slip equals about 12 x 24 = 288 hr versus about 16 hr work if everything is included = 288/16 = 18:1, perhaps a bit more. However, if I eventually spent 16 hr day-sailing only in the next month after doing all of that, then 16/16= 1:1 for that set of repairs. If going day-sailing only those items would be on the two pages that got thrown away as in #34, and the S/BMR ratio could be very high since all I'd really have to do would be the wash down afterward.