Yes.

When you drop a day of reserve after your schedule is posted, you lose a pro-rated amount of your reserve guarantee. (If you did it before the month, it will actually change the value of he proration. Use John Bell's reserve calc to help because it's a mess to figure out on your own).

That sets the reserve guarantee that you will get paid this month. Now, forget all about proration. It no longer matters.

Now if you work ZERO hours, you will get the reserve guarantee. If you fly the exact number of hours your reserve guarantee listed, you would still get paid that same amount. If you fly any amount in between, you get the same amount. If it takes you 4 days to fly 20 hours, or 3 days, it still counts as 20 hours toward your reserve guarantee. You still owe all of your reserve days the rest of the month.

The only time you are going to affect your pay now after you have set your reserve guarantee is if you work more hours than you were actually guaranteed (or green slip, but that's a separate difficult concept for many new guys on reserve). If your reserve guarantee is down to 65 hours for the month, and you have worked 25 hours, it will say that you have 25 hours of credit and 40 hours of reserve guarantee. It doesn't matter how many days of work you have left in the month. If you keep getting assigned flying or volunteer to fly a lot, you can actually get your flight time up above the reserve guarantee. Then your time card will say you have 70 hours of credit and 0 reserve guarantee.

The reserve guarantee is just a pot of money that you will get at the end of the month whether you work or not. On reserve, you win if your reserve guarantee is high and your credit is low. If you want to earn more than the reserve guarantee, though, you will have to volunteer to get used for flying. Then, after you fill up, you can still yellow slip for more flying if you desire. If you desire to fly a lot, being on reserve is a very bad way to do it, though. You have very little control over what kinds of flying you can get, and you will see most of the good trips being swapped or white slipped while you get what is left over.

I get that you may not have an option to bid a line yet. Good luck. If you want to work a lot, bid a line as soon as possible. If you are in a well-manned category and like to avoid work, bid reserve.

PM me if you have a specific question that I didn't hit here.