Chris, sealing the grout won't prevent it from absorbing water, though it may take it a bit longer to do so. Sealers aren't permanent, either, would have to be reapplied regularly.
Letting the fan run helps, but it takes a lot longer than 10-15 minutes for water to evaporate off all the surfaces. Cracking a window might help if the bathroom door is closed, probably not all that helpful if the door is open. If the shower has a door, or even a curtain, leaving it open will help.
Using a squeegee, and even a hand towel for the corners, will likely be your best defense, and will probably stretch cleaning intervals out quite a bit. I squeegee mine after each use, including the floor, takes me about 4 minutes. In the almost 1.5 years since put into service I've had to clean the floor only 3 times, never the walls, except for the niche. The shower has no door and I let the fan run for 60 minutes (probably over-kill).
Squeegeeing is zero fun, natch, but the upside is the shower is pretty much always clean, and it honestly looks like it was just installed.
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Dan
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If I recall correctly my memory is excellent, but my ability to access it is intermittent.
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