What do you mean by "trip"? I'm assuming you're refferring to any drug with a short duration? People metabolize drugs at varying rates but
for me codeine, kratom, tianeptine, kava, and cannabis all fall into that short duration category and aren't considered
too hard, though you wanna tread carefully with any opioid.
This question is very open ended, plenty of RC's like MDPV, methylone, mephedrone, (and quite a few others) as well as short acting psychedelics like 2c-c, 2c-d, and of course DMT are also pretty much over by 4 hours for me (especially DMT, obviously) but most if not all of these drugs definitely fall into the "hard drugs" category. Listing every drug with a short duration isn't really feasible.
Ps. Just a heads up, we're not allowed to give you recommendations on what drugs to take so let's not turn this into a "what should I take" thread please