Not a definable number, will be based off each plant genetical disposition.
The rate at which organic matter breaks down is the primary factor that determines how quickly nutrients become available to plants.
Funny thing is if you take a soil ec metre and measure your soil will probably sit around 0.5ms/cm to 1.0ms/cm. Which is perfectly OK. A higher electrical conductivity (EC) level in a growing medium indicates a greater abundance of total dissolved salts, which primarily consist of mineral nutrients. This elevated EC significantly alters cannabis plant growing parameters and has profound effects on plant health and development.
An organic soil can hold up to 1.8 mS/cm (milliSiemens per centimeter) ballpark before problems occur.
What’s a more nutrient needy plant ?
Who cares when the ec never goes over 0.8ms/cm.
Electrical conductivity (EC) is an indicator of the total amount of available nutrients (soluble salts/ions) in the growing medium, which is directly linked to a plant's "feeding" or nutrient uptake rate. Increasing the transpiration rate of a plant generally supports an increased rate of nutrient uptake.
NPK and all the rest account for around 6% of the dry matter of a plant after all water has been removed.
The other 94% of that dry matter is carbon, oxygen and hydrogen.
What do you think matters more?
Best of luck n stuff.