Wow. For sure, that'd be a lot of studying. Becker advises 120 hours for REG and you're listing 240.
Personally, I've been studying for Reg full-ish time for 4 weeks, will be taking it Saturday, and feel fully prepped. My “full-ish” time really means ~3 hours of dedicated study per day if I'm honest with myself so it's a bit lower than Becker's advice but I also feel a little nervous.
My wife did both REG & BEC in the same 4 weeks studying full-time.
Don't be nervous about having enough time. If you follow the Becker method and actually study that much then I am confident you'll pass. Not so much if you watch TV while you're studying and otherwise goof off.