In any solvent extraction where you can add time and temperature your yields will be the highest. More time and temp the higher but expect to max out at around 95-98% of what is in the plant. So that depends on what is in there to begin with. But with numbers like that you can use the process to tell you that.
The key is matching the polarity exactly and finding the right combination of all those controls.
Thank you for the advices but I have some questions:
What do you mean, time and temperature? I have to put higher temperatures on what, the extraction tube?