When you replace a drier/receiver and also high side line between the compressor and the condenser, do I need to add PAG oil? Then how much?

 

I found the amount to be put in Haynes service manual.
The problem was that I replaced the drier first and then the line. While I was working on the line, I struggled and the circuit was open for one or two hours.
I found another problem to AC system, so I need to work on that.

My question is: Should I replace the drier receiver AGAIN since it was open to the air for an hour or two?

 

Haha... No one is responding...
I have one more thing. When I replaced drier receiver, there still was pressure, and oil spewed out. What do I do? Do I evaculate all the remaining oil from the system? Then how?

Or just add what the manual says that drier receiver needs?
Also when you add PAG oil for drier receiver, can I put it from the high side, or do I need to take the receiver off, and pour it directly? Maybe can I use the high side port since it is right before the drier?