I did two a day. It took the entire day, but it was manageable even with some free time. But if your entire day isn't free and you aren't willing to use it, it's hopeless.
If you don't want to consistently do two a day, try doing two a day for chapters/subjects you're especially strong in. Since you have only 45 days, you should probably get this content review done so you can get some practice passages and practice tests. And you definitely don't want to be doing content review close to the date. But make sure the content review is still thorough.
op is asking for advice and you're telling him stuff he already knows. Do you think he's a toddler or something? I'm sure he has his books already, and if he doesn't, i'm sure he knows they will take time to reach him.