Merino tee still damp twelve hours after a sink wash in humid rooms Laundry & Care

Wringing is your problem. Twisting merino leaves water trapped in the yarn and stretches the shoulders at the same time. Lay the shirt flat on a dry bath towel, roll the towel up like a swiss roll with the shirt inside, then stand on it with your full weight and walk down the roll heel to toe for about 30 seconds. The towel pulls out far more water than your hands can, and the shirt comes out damp rather than wet. After that it needs airflow, not heat.

Shower rail is the deadest air in the room. Put it on a hanger and hook it in front of the AC unit or the ceiling fan, ideally with the hanger turned so the shirt hangs across the airflow rather than edge on. If the unit has a dry or dehumidify mode, run that instead of cooling for a couple of hours before you sleep. Moving air beats warm air every time with wool.

190gsm is a winter weight for that climate. I moved to 150gsm for anything tropical and drying time roughly halved. Downside is you can see through it a bit in light colours and it will wear through at the pack strap in maybe a year.

You probably don't need to wash the whole shirt. Most nights it's the collar and the underarms that need it, so I spot wash those two areas with a bar of soap and leave the body dry. Full wash every third day. Cuts drying time to almost nothing and the wool lasts longer.

Merino is overhyped for the tropics honestly, just take polyester and accept you'll smell a bit.