Originally Posted by
Seol
The timed quests must have a yellow dot next to it to know that it's going to give a voucher, otherwise it's not the "1st time" and it's considered a repeat, so only sparks/exp, you can also tell by the sparks yield on the 1st try, it says "a bonus for the 1st time 900 sparks, blah blah", repeats are only 300 sparks. So far I've stuck by that on 2 characters and I've always received my vouchers twice a day 100% of the time, even when full inv, you can reclaim by clicking on the timed challenge log.