I have lots of things in sphag because it works for my growing conditions. Some items are mounted and I spray them daily until the sphag is good and moist. I turn the nozzle so more water comes out with each spray. The potted ones are watered when they feel 'light'. I make a judgment call based on the actual weight of the pot and how the moss feels to me. Sphag can be hard to re-wet if it dries out too much. If this happens, either let the pot sit in a saucer of water for an hour or so until the water moistens the top of the moss, or if it is a mount then spray it really well.
Best of luck!
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