I notice that you have not had a reply to your enquiry yet, and so, not being an expert on this subject by any means, I wonder if I can draw your attention to my website, http://www.majorpillinger.com
My attention was drawn to a booklet called a Cavalry Roll Book which was being sold on eBay, and was written by my Grandfather. Having researched his career with the Tenth Royal Hussars for some six years or so I knew nothing about this booklet, and I bought it.
This is volume 33, dated 1889, and belonged to a Dragoon, indicating it was extensively used. Over 43 pages in the preface it details most of the current regulations and covers service periods on page 14.
Have a look, and I hope it helps.http://majorpillinger.com/cavalry_roll_book/