I transplanted my plant the other day into MG soil, and during it's first 6 hour dark cycle it grew close to a foot! I don't know why and how this happened.
You live next to a nuclear reactor? I've never seen or heard of any plant of any kind with that much growth in a six hour period. Either its a mistake or you have discovered the worlds best grow system.
The most growth i've had was two inches in about 10 hours and that was a clone, right after transplanting. I left for school around 8 am, and the top of the plant was about three inches from the cfl. When I came back around 6 the top leaves were dried up from touching the bulb. But a foot, in 6 hours? Now that's a case of a wild imagination.