Yeah - it will take forever with a garden hose.
See if it will accept a larger hose diameter. That will provide better output and make the drain go quicker. The faster you can drain and refill the better.
Your other option is to rent a pump from Home Depot. I believe they are $50/day and comes with a large 50' long hose.
Are you in the City of Phoenix or the 'burbs? Check with your city to see where you can drain to. Here in Chandler, we drain to the sanitary sewer cleanout in our frint yards.
After you are done, run the pool pump for about 30 minutes, test everything again (no need to do CYA if a complete drain/refill) and post your results here. We will get you headed in the correct direction.
Also, fill out your signature with pool, pool equipment (including manufacturers and model numbers) and test kit info.
Be detailed on the equipment. See mine and others for inspiration.
This assists us in providing you help without needing to ask for this important info each time.