As you watch the water flowing from the condensation pan drain pipe.
Sometimes enough to water the garden.
Yes to humidity. I keep a bucket under mine. On a typical summer day I get from 7-10 gallons drained from my a/c drain pipe
you wouldn’t want to use that condensate to water anything you were going to eat though.
We empty both dehumidifiers twice a day. We have good windows too. Not the best, but better than contractor grade.