There used to be even bigger sales not in hours but in minutes, if I'm not wrong there have been at least one ICO that received way more than $1.5 million in less than a minute. But it was all in 2017 which as of now stays recorded as the most crazy year in crypto. Now it's different times, yeah, investors are scarce, interest in crypto is waaay below what it used to be back in Decembar. Still, this seems like a decent project and no wonder it managed to gather some nice funds.