good question, no straight answer as it depends where and which...

good question, no straight answer as it depends where and which lab they send it to, did they send in batches or hold everything to the end, what methodology they pay for aka aqua regia or four acid and to what level. whether they do cyanide leach testing as well (probably too early for that).

i would like to say 2-3 weeks ideally but not knowing the backlog of the chosen lab and selected method, (plus logistics and dispatch) hence hard to say.

safe guess, say a month with give or take 2 weeks either side.
they could of also chosen to utilize a xrf as it can detect down to 50ppm Cu but i never read anything in their reports.

life is full of surprises