toytech coilover adjustment?

So my toytec coilovers have just come in. Im most positive that they are pre set at 2.5"s right. The only question i have is when i want to adjust them to 3"s how much do i turn them. How much of the threads should be showing on the bottom. and they do go up to 3.5 correct? So if i turn about half of the threads that are left i should be at about 3"s right? sorry for all the questions.
Thanks

 

Im sure there is info about this. I just cant find it.

Sorry guys i just seen the small print on the bottom where it says every 1/4 inch of thread is about 1/2 inch of lift.