We've given you plenty of tips on studying for REG but let's go over it one more time, shall we?
Is 1 month enough time to study for Regulation? I haven't studied yet and I have the exam scheduled for beginning of August.
Regulation should take about 80 and 100 hours to study for, since we don't live your life we can't tell you how much other stuff you would have going on in a month so it's up to you to figure out how to fit that time in. In a general sense, it can be done in a month but you might be better off taking slightly more time just so you aren't overloading on information. Regulation isn't a huge or overly-complicated section but if you're trying to do all your studying in one month, you're going to have to cut out just about any chance you might have at a social life between now and then.
When trying to "cram" for a CPA exam section, it is easy to over-study in an attempt to get in as much studying as possible within a short period of time. So this is a good time to point out that your brain learns in layers and gets bored easily so don't study for more than 3 hours at a time without taking a long break. If you plan on spending your weekends studying, stick to the 3 hour rule and try to plan something moderately enjoyable for yourself in between (renting a movie is OK, going out and getting wasted is NOT).
Studying 3 hours a day for 28 days will clock you in at about 84 hours, which is on the low end of study targets for this section and kind of exhausting. If you can buy yourself a few more weeks and put off your exam, you can stick to 1 - 2 hours a day and still have a life. Be diligent about creating a study schedule and sticking to it as you're short on time to study as is, you can't afford to miss 2 or 3 study sessions.