If you're not using hot water, try that. It seems to really speed up the process with the compressed brick. Once it gets super tall, I usually break it in half and soak the other half at the same time. Did one last night and it only took about 20 - 30 minutes. As for using it as a substrate, I love it. It really holds moisture well. My BP likes burrowing in it too, especially under his water bowl.
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