Minimum size of sand school

[Libbyo]

Whats the minimum practical size of sandschool needed for driving. Single 14.2 horse.

Ta.

[oinkmoooink]

weel i wouldnt really want to use sand as my surface, perhaps a mix of sand and some other fibre? And umm...well i find it difficult to do schooling in a 20 by 40 school with a 12'2, i believe at the unicorn trust they have 30 by 60, i woudnt want to use anything smaller than that and it works quite well
The minimum size of a dressGE Arena for driving is 20 by 50 for indoors i think, and 40 by 80 for outdoors i think?(meters)