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Over that area and with four supports I reckon 10mm ply will be strong enough in general, but it would sag a little - I’d glue and screw/biscuit on a lipping if you can (taller than it is thick, say 25x15) and that should sort it. I’d do that anyway as thin ply can just as easily warp without any load on it at all!
Dugtheslug
Built into an old cupboard and supported in four corners with little peg thingys.