The "one month rule" would apply for 6-APB since it is a potent serotonin releaser like MDxx. 5-MeO-MiPT it as 5ht2a agonist but also a serotonin and dopamine reuptake inhibitor if my memory serves me well - this means that it'd be good to wait between trips, but no longer than any other psychedelic, so even just a week or two can be gotten away with.
not to 5-meo-mipt not sure about 6-apb... 5-meo-mipt is a tryptamine and doesnt effect your serotonin like mdma does, the only thing you have to worry about is tolerence to the substance which will be similar to other pychedelics