I started with very few surveys and researches, I get paid for none. Usually I spend descent amount of time feeling out the study - similar to what is estimated by them, but in the end I get informed, that quality of my work is not enough to get paid. I usually count my time, read questions carefully and answer all questions, write decent amount of text to explain my feelings out of testing. Of course nobody verifies it, I get this message immiedietly after completion which tells me - that they automatically revoke my study, just to not pay for it.