We actually have had different times for them! One was 10 days, we've had a 5 days one. This one is a bit more challenging because it's 750,000 (when last time we did 750k you had a few more days). We don't want it to be just a giveaway, and you guys have proved in the past you have the dedication! ;)
Also for those pointing out we didn't advertise/etc enough for the quest-a-thon, you can look at the past times we've done this and it's usually less than 24 hours beforehand. This time we did it two days before plus twitter/fb. This isn't going to be the last quest-a-thon (we've got another planned for this year even!) so if you don't make the goal it's not that bad, you'll have another chance at some cool prizes. :)
Once again though, going to point out what I said in the news comments: We're not going to give out CSC/cash shop items as prizes in any quest-a-thon. That would be way too much going into the system. We generally do a pet slot, currencies, forum titles, etc because they're not going to wreck the economy or anything and we try to appeal to different things (some people collect forum titles, a lot of people enjoy pets but don't want to spend the CSC/literal millions of sP on them, etc). :)