[chryuop]

It also depends how you study them.
It took me somewhere around the year to learn 250 kanji. However I do not just learn a sound, for each kanji I learn both reading and try to learn all the meanings as well.
Just to make you understand how long it is, to repeat all 250 reading+meanings my lunch hour at work is almost no longer enough.
Now if you are just "dicking around", what you want to do is fine. If you want to find a constructive way of studying, take your time. I don't think you use Japanese on daily bases, thus what you learn will be forgotten soon. You need to review you kanji everyday (ALL of them) and add new ones only when you are ready. Rushing a bunch of pictures in your head will bring you nowehere. Moreover the more you get into kanji, the more similar kanji you will find and the more you will get confused.
I would also suggest once you arrive at a hundred or so, review you kanji and start writing them down on a regular bases.

Studying kanj is not impossible, but it is not a piece of cake. If you want to stady seriously then plan very well what you are about to do. If you just look for a way to waste time and not learn anything, then you are on the right path.