m-station Talent is 2-metres deep, when it is positioned on a slope, where you can keep the ball in the air with your feet and head. In addition, the player must have an area of 1.5 – 2 metres to stand on. So 3.5 to 4 metres are fine for exercises, in which you are standing close and have the ball in the air.
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If you want to make passes along the ground, you do not need as much space, because in this case m-station Talent is placed vertically, and the depth is only 120 cm. The player can easily manage with 2 metres, so that requires a total of just over 3 metres.

Still not sure how much spaces you need, check out some of our users videos.