Using foil will be hopelessly inaccurate, you'll get much different efficiencies depending on technique. Use a glass pipe if you're going to do it at all. If you can afford to get some of the most exotic psychedelics in the world, you can also afford to use it in a proper, repeatable way.
Also, it lasts for more like 5-6 hours IME, as has been the experience of some other 10 friends of mine, 1 hour does not sound right at all...
Like I said if you don't have a microgram (I use one accurate to 10 mics, which is good enough, to 100 wouldn't be...) scale just don't do it at all. People will die if they do this, I almost guarantee it. And then this compound will be scheduled like all the other ones.
I'm not sure you realize just how small 100 micrograms looks like. It's TINY, almost not visible. You CAN'T cut up a 1mg pile into 10. People couldn't do that with DOx (and that was 10mg piles into single mgs), they got their arses handed to them on a silver platter, so what do you reckon the chances are like for something more like 10 times as difficult?