Speed Stick Deodorant

On 14 December 1997, for reasons than now escape me, I noted the date that I started using a new deodorant stick—the brand I had already been using for years before then, Speed Stick by Mennen, 3.25 ounces. When I replaced that stick with a new one almost a year later, I recorded the date, and have been keeping track since then. I guess I have a mysterious curiosity about such minutia (I love to put dates on things, such as when I acquire or read a book, or write a poem). The following table records the number of days I used each deodorant stick since I started keeping track, complete with the dates involved, plus the location where I was living and other occasional notes. You really wanted to know all this, right? Nod vigorously if you’re as fascinated as I am despite the oddity of it all. And scroll down for a graph and additional comments.
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Number of Days

Location / Notes

14 December 1997


Foster City, California

10 December 1998


 3.25 oz

9 August 1999



10 April 2000



1 December 2000



29 August 2001


Belmont, California

1 May 2002



2 December 2002


Redmond, Washington

15 June 2003


Sammamish, Washington

19 January 2004



29 August 2004



11 May 2005



4 January 2006



20 November 2006



19 July 2007



15 March 2008



1 December 2008



11 September 2009



20 May 2010



6 February 2011



2 October 2011



28 June 2012



24 June 2013



18 August 2014


3.0 oz?

4 June 2015


3.0 oz (hereafter)

 28 January 2016 238

2 April 2018


(did I forget to record the previous date?)

 1 June 2019 425 



356.5 days per year on average

It’s been interesting to see how varied the length of time can be for each stick—as low as 195 days (just over half a year) to as many as 798 days (about a year and three quarters, or four times as long as the shortest time). I always put the deodorant on the same way regardless of the weather, so hotter months are no explanation for the rather wide variance. One possible explanation I have for sticks that lasted longest is that those days have sometimes corresponded to periods when I worked at home, and may have skipped having showers sometimes. But great variance occurred even when I wasn’t working at home, which I can’t explain (the variance, not working away from home). Perhaps more likely an explanation for the highest number is that I neglected to record a new stick sometime in 2017.
        Since the start, I have been careful to get the exact same brand each time—and I thought the same size. The plastic dispenser has always remained the same in size, but somewhere along the line the amount of deodorant in each package changed. At some point the 3.25-ounce size was reduced to just 3.0 ounces. Not sure when that happened (maybe someone at Mennen could tell me?), but I do know I always used the same the deodorant brand with the same size packaging, and I know the product size for 2014 or 2015 and later was definitely 3.0 ounces, and that I started off with 3.25 ounces, even though the size of the container never changed. If we factor in the variable that later usage days were from a smaller product amount, I’ve been getting even more mileage out of less product content in recent years.
        The following chart indicates usage up to June 1 of 2019 (number of days of usage per deodorant stick).

As of June 2019, the total number of days, 7,843, divided by the number of sticks, 28, equals an average of 280.1 days per deodorant stick. So far, the lowest usage was 195 days, and the highest was 798 days (409.2 percent higher than the lowest, assuming I had not failed to record an intervening deodorant stick). 
Stay tuned for more thrilling data in the years ahead. Try to contain your excitement.

Notes: Number of days determined at http://www.timeanddate.com/date/duration.html or http://www.convertunits.com/dates/ (both excluding end date). Just so you know, Mennen was acquired by Colgate-Palmolive in 1992.