I ensure that my garden gets watered at least twice per week (except the onion/garlic bed which is once per week)

I have a system of rain barrels at the corner of the house and then I have rain barrel storage under a cedar tree. I use PVC pipes to connect the barrels to a pump and then a pvc system of pipes to pump it the garden. I have several cut of valves in the system including one at each barrel as the barrel empties I turn off the valve and turn on another barrel.
(3/4 inch PVC)
Each raised bed has a valve that is connected to a pvc pipe(1/2 inch) that runs across the top of the bed their are two soaker hoses connected to the ends of the small pvc pipe (1/2 inch) that run the length of the beds. I turn three raised bed valves on at a time and run them for 20 minutes, then I turn on the other three beds for the next twenty minutes. My beds are 4 concrete blocks wide by 11 concrete blocks long. except for my squash beds which is six concrete blocks wide. The system works wonderfully. Although I do remain present during the full operation. Since you have more beds it may take longer.