for questions like this it helps to state in your profile where you are from.

it took several weeks for the first one to arrive - but I am in Germany. The second one was more like 10 days and I though ups that was fast.

so depending on when in june you want to travel ... if things go south, you might then try to exchange with somebody through coupon connection as in "will give back later".

also think about if it is possible to have two of those certificates if that fits your travel pattern.