Hi Maxie
The amount of time to soak off can vary wildly.
It's down to so many things putting a definate time on it is just about impossible...
Temperature, product type, remover type, how you hold your tounge, it all counts...
Also some gels are so non porous that soaking off would be a total misery....
(actually, any hard wearing gel should need to be buffed down, with the final thin layer soaked off)
Even with L&P there can be massive variations... depending on brand, thickness etc...
I personally find the best way to soak off (and the least product wastage)
is to apply product remover to a lint free pad and wrap the finger with the pad and then tin foil (this keeps the heat in, the smell down, and reduces evaporation) Also, this way, you don't have to buy anything new.... just a thought?!