Psychedelics (e.g. LSD) can also give you a hands-on and interesting view on the subjectivity of time.
Probably because you are overclocking/unfiltering your mind and get flooded with inputs and thoughts, confusing this internal timestamping.
you are confusing LSd with speed here. A case of beer helps, too. And if that's too fast just wind it down with Marijuana. When your heart stops, that will give you a unique view on time, too.
Maybe it alters my perception of time so much I don't know whether I already tried it. So, I'll have to assume I already did. What were you trying to say? I don't think you know what "fundamental" means. Most people get along fundamentally well without having tried ...