Is it normal for your bow to warp(horizontally toward you)?
I play 1-3 hours everyday for the last 4 months.
Doesn’t sound quite right to me.
Do you slacken of the hair tension when you put your fiddle and bow away? They’re best not left under full tension - especially wooden bows.
My Incredibow is the only one of mine that stays at full tension, because they are built that way.
And how tight do you have the bow hair?
It depeds on the amount of warp, but if you can notice it that easily, there could be trouble. Over-tightening and failing to relax the bow are the two common problems. I’ve been told that incorrectly installed hair can do it too, but I’ve not eperienced that myself.
That sounds like a faulty bow, although my first thought (like above) was could there be a failure to slacken the hair when you’re not playing?
Otherwise, sounds like bad wood.
I would venture to guess overtightening; I ruined a (cheap) bow this way when I was first learning viola in grade school.
Its possible you have a bad stick, yes, but without any information on what kind of stick it is (pernambuco, round/octagon, etc.) and who its by, its hard to diagnose that. I have found that when my bows warp (the wooden ones that is), they tend to warp in this direction. This could also be because of how you play; if you dig into the string with lots of arm weight pulling the stick down into the strings, a warp may develop. My best viola bow has a slight warp like this, and I believe that is the reason.
And if its a fibreglass bow, then I think its safe to call it faulty 
500th post 
How much warp is too much?
I’m just starting fiddle too. I noticed a slight warp in my [wooden] bow pretty early on, as if it was that way when I received it. However, it’s only noticeable when I look down the length of it from the very end. I think the stick doesn’t even warp out farther than the edge of the hairs, which doesn’t realy worry me. Should I be worried about it?
Many wooden bows will develop a slight warp. I wouldn’t worry about it too much un;ess it starts to get worse. A good luthier trained bow repair has a way to correct a stick warp; I’ve been sucessful in straightening out a few sticks. But getting a bow straightened will often cost big $$, so make sure the bow is worth the work before hand!
How much is “overtight”? I like my bow nice and tight when I’m playing it (about enough space to fit another stick between the hairs and the stick), but when I put it away, I always slack it down until I can see individual hairs drooping from the edge of “ribbon”, then I tighten it just enough to keep the hairs together.
“Overtight” will varry based on the flexability of the stick, and the flexability of the hair. Generally, being able to fit a pencil between the space where the bow hair and the stick are the closest together is about right, if not a tad tight. Really, you will be able to tell while playing. A bow that is too tight will keep you from being to do spiccato strokes and off the string bowing smoothly without crunching harsh landings. A bow that is too loose will ‘bottom out’ when trying to play louder dynamics, casuing a scratching sound. When playing with your maximum amount of bow pressure (and still achievign a good tone), the bow hairs should nearly be/touching the stick. You can test flex by finding your bow’s ballance point, setting this part of the hair across a finger, and while holding your bow correctly, applying and releasing pressure. Change the tension of your bow until there is a mild pressure required to push the stick to the hair.
However…
I realize bow pressure is very mcuh a matter of personal preferance as well. I generally tighten up a little more than needed; sometimes during a long piece if the humidity’s interesting, a bow will loose a little tension. Expirament with your bow during playing. But NEVER tighten a bow so much that the stick and hair is parallel. If you need to do this to get good bow tension, see a luthier pronto!
Wooden bows generally develop a slight curve, especially if they are used often. For the most part this will not affect the sound or playbility of the bow as long as you need to hold the stick out in front of you in order to see it. Four months seems like a very short amount of time for a bow to develop a curve, though, even with your hours of play.
What is the bow made of? Pernambuco, brazilwood, composite, carbon-fiber? Did you get it secondhand? Did you spend a lot on it?
Luthiers can “temper” a bowstick to its original curvature without damaging it in any way, but as others have said it is very expensive. Until the curvature is very noticable I wouldn’t worry about it, and definately don’t consider it unless you spent a sizable chunck on the bow.