Im not saying its impossible, but highly improbable. I really am convinced any may achieve a " Medal " test level at the higher grades in that time perid.Its not only about the "teaching " time per se , but " floor time " .
I, as others on here, Im sure , have given 100s, maybe 1000s , of medal test exams, and cant recall anyone taking a Silver exam ,in that time period.. more power to them ,IF they achieve that level with competancy.