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Kids....when I was growing up....neither of my parents smoked. And they certainly did not condone the use of Marijuana!!
I was an everyday smoker when I was a kid. If the folks were gone, my rule was 4 hours and I could smoke anywhere in the house and they couldn't smell a thing. Now..there was no Hydroponic "sticky icky" available back then in the 80's where I came from either though....just good green weed.
I smoked in the bathroom standing on the toilet with my doobies right next to the vent fan religeously, almost every evening. They never suspected a thing.
I'd just take a quick 2 minute shower (us guys are fast) jump on the toilet and fire up. Coming out of the shower with your hair wet and being in a towel is a pretty good cover up for being "baked" as well.
Haha, I used to think the same thing about 4 hours, but now as long as I know where they are and an estimate, I'll smoke if they're gone for 40min. I just time myself so I'm done smokin' in 15min and by 30min then I have put in eye-drops, sprayed some axe, and ate something to further cover the smell. They'll come home with me still high as fuck but my eyes aren't red, and theres no smell (since I smoke outside anyway) so theres no worry.