For 10th scale (on or off road) all your lanes will need to be at least 2m wide otherwise the cars struggle to turn full circle in them.
Straights less than about 20m end up feeling pretty short.
To get a nice variety of corners you need to have 4 lanes depth to the track.
I would say any track much smaller than 10m x 20m starts to feel small. You might just about get away with 8m x 16m, if you want a realistic "practice" track.
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