Depends on how high you take your chlorine each day and what your CYA is and what the weather is like. You'll just have to get to know your pool. If I was you, I'd take my CYA a little higher--- up to about 50ppm.

Each evening, test your water and add enough bleach to get the chlorine back up to 6ppm. The next evening, see what your chlorine level is when you test in the evening. Again, add enough bleach to take it back up to 6ppm. After a couple of days of doing this, you'll start to see how much is a normal chlorine loss for your pool in a day. You may find that you can skip a day and add bleach every other day. You want to make sure you keep your chlorine in the proper range per the Best Guess Chlorine Chart (in my signature below).