My View on the over all jumpship numbers is to 10x the 3050 numbers of 3,000 (so roughly 30,000) for the great houses, but use the old 3025 numbers of 2,000 as the jumpships available to house militarys.
So on average each of the five houses has about 6,000 jumpships, 2,000 are used by the military
Further brake down of the military ones your going to have some that are active, others are just entering their active phase/ undergoing training and shakedowns post refits and the remaining are entering a refit period. At best one could count on about 1/2 to about 4/5ths of their over all numbers to be able to respond given a few weeks notice., depending on the ratios used. So ~1,000 to ~1600 jumpships for the military at one time of which they are needed for troop transport (tactical), cargo & personnel transport (strategic), naval escort, naval patrols, customs duty and so on.
Currently im viewing a 3 year active duty, then a ~6 month refit followed by about 6 months of training & workups, with many crews fulfilling their 5 year (basic) enlistments during this period, being ~2 years training followed by a 3 year tour of duty, with the last 6ish months of their training being on the ship in it's working up phase.
These numbers do not include Mercenary, Comstar, the minor houses nor the Clans.
All told perhaps at most some 45,000 jumpships.
Though It should be stated that even Civilian ships are going to have a fair number of ships not in active use, though far fewer and with less down time, perhaps going as far as having two crews to minimize downtime to crew needs.
