Cannabis does not need rest. A 24/7 light schedule is perfectly acceptable if you can manage the heat/extra power consumption.
The extra "growth" you see during lights out is called stretch. It happens.
The amount of light your plant can absorb is dependent on many factors though. Read up on light saturation point.
FWIW I personally use the gas lantern cycle (12/1). I use a lot of power and its hard to cool all at once. With the GLC I can flip flop my veg and flower lights. Keeps my power consumption constant and don't have to try and cool all my lights at once
only downside is co2 generator stays on 24/7..
To each there own.
Sir KK