How long did you train before getting a clean double axel?

I've been skating for three years but only once and occasionally twice a week. I've landed quite a few axels and double salchows but I've never got into the correct back spin posistion while it the air. For me this is the most difficult part as I can clearly get the height and speed. It's about how much effort you put into your skating and whether you are being taught the right technique so the amount of time for you to be able to do them is up to you. There are various exercises you can try to get your body used to the feel of an axel. For example doing a three jump (waltz jump) and from that, landing immediatly in the back spin posistion to do a back spin. You can also try axels at home just in your garden with trainers, this way you can practice getting the feeling of how its meant to be so you feel more comfortable on the ice. Hope this helps :)