As much as I know, they usually ask for 200-250g as a test amount, but I don't know about the total recharge amount. I would recommend you going to a local store and ask them about this issue. I also had a problem with my air conditioner last week. Lately, I've also had an issue with my air conditioner. The lights on my aircon kept on blinking, and I had to do something about it. I decided to fix it myself, and I started to watch lots of YouTube videos but still couldn't fix it. Then I decided to search for some guides on the web, and After hours of searching, I ran into a website with all the information about blinking lights and how to fix it. After reading, I understood the problem, and after all, I managed to fix my air conditioner.
If you don't have a professional A/C machine I would recommend taking it almost anywhere that offers it. The extra $40 or so is worth it to get the system full evacuated, add oil/UV Dye and properly recharge the system.
The quantity depends primarily on the insufficiency you have. But when you turn to the specialists they make a calculation. A well-established price catalog with cost-effective prices for customers have https://www.airconservicing.org/type-of-aircon-service/. I do refueling at them periodically, which facilitates both my budget and I have indescribable comfort when driving the car. Driving in extremely hot weather is very difficult, especially if you do not have air conditioning. But it should not be forgotten that often mechanics who are not good specialists do not reload correctly and there are losses from this amount