How long would damage be noticeable to iPhone from water?

I usually listen to music when doing chores around the house, so I put my phone in my waistband and listen with earbuds. Not to be gross, but on days that are hot my phone will sometimes get sweat on it and I usually just wipe it off, but it probably gets a thin-ish layer of sweat on it frequently and it stays on frequently. Today I had to clean things outside and my shirt got damp, not drenched or dripping water, but it's still a little moist thirty-forty minutes later. I still had my phone on and probably for 30 minutes after I initially got water on me. My phone is an iPhone 8 and it has no visible signs of being damaged. It feels dry (currently) on the outside, but it has a case on. Could water have gotten into the microphone or speaker at the bottom? Has fire ever been a hazard when phones get wet?

Don't worry about it.

Phones can handle reasonable moisture.

Sweat is Not just plain water.
It is loaded with salts and other chemicals.
Look it up!

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