If your HVAC is losing refrigerant that quickly, then you have improper system oil distribution. Oil tends to leave the compressor and flood the evaporator when there is frequent loss/refill going on. I've seen this MANY MANY times over 46 years professionally. This sets the stage for eventual compressor failure all because of ignorance and improper procedure. This is why the owner's manual and the underhood information label, telling how much and what type refrigerant and oil capacity are required is there, warns to have only "qualified personnel" perform service.
If the evaporator is oil flooded, it must be flushed, and the condenser has to be flushed as well. This requires hazardous chemicals that require PPE be used such as a respirator, goggles, and nitrile gloves for your protection.
Next, you must determine IF the compressor has the proper amount of oil in it. Most cases, you have to remove the compressor and drain it into a graduated container.
It IS a PITA, for sure, but doing it correctly the first time prevents aggravation and insures proper service life of the system.
Also, a word to the wise: ALWAYS replace the accumulator or desiccant bag or entire condenser (required in some situations), and vacuum the system for AT LEAST 45 minutes! I hope this helps!
BTW, I lost a friend to an A/C system explosion years ago... due to him failing to use personal protection gear and following proper protocol. Years later, a co worker had a can of refrigerant IN HIS HAND with the engine running and him topping off his A/C. The can unexpectedly exploded! The bottom of the can went through the steel hood of his F-150 like it was soft butter! He couldn't hear for a week afterwards! The ONLY thing that saved his eyesight was the protective eyewear he was wearing pursuant to shop policy!