How Long Should I Train My Horse Daily?

horse to eventually be brought to higher levels of fitness with ease.
To fulfill this daily minimum aim to keep your horses movement active and purposeful. In other words eliminate any idle time from your brief exercise session. It is also necessary to avoid repetitive activities like lunging every day. Even if you are limited to a walkonly program find ways to vary your routines daytoday. This novelty of stimulus for the horse improves resilience of soft tissue and muscle activation. 
To summarize using a dressage horse as an example the weekly training might look like this as a Maintenance Phase
Monday 25minute brisk walk on trailsroad
Tuesday 20minutes of lunging including walking over ground poles
Wednesday 30minute ride
Thursday Off
Friday 25minute ride
Saturday 25minute brisk walk including groundwork exercises such as circles of various sizes shoulderin gait transitions etc.
Sunday Off
Building Phase
A horses daily exercise timeframe during the height of riding and showing season differs considerably from that of the Maintenance Phase. Here he needs longer sessions overall but more importantly a spectrum of conditioning challenges throughout the week. To make the required fitness gains for this season the horse benefits from both long and short sessions.
At the beginning of the season you can begin gently increasing daily sessions by five to ten minutes from your Maintenance Phase. After six weeks of consistently training the horse four or more days per week at low to moderate speeds and intensity with this progressive buildup most of your sessions should be around 40 to 50 minutes in length. There can certainly be occasional shorter days in the weekly schedule for many students this takes the form of groundwork or an easy hack day. If these days begin occupying bigger percentages of the schedule however detraining becomes a concern.
From this point conditioning and workout durations become more specific and nuanced depending on the goals at hand. Generally fitness is often increased within the structure of a four to sixday work week with most sessions between 40 to 50 minutes by adding one or both of the following to the week a high intensity workout andor a longer low intensity session.
To reiterate these additions would only be appropriate if the rest of the schedule remains consistent enough to support them. You would not add these components if your horses activity level is closer to a Maintenance Phase than a Building Phase. These two elements can be adjusted weekly to turn