In the new build I have tested tacking at 25 kts, 17 kts, 10 kts. Resulting times are around 2 min, 2.5 min and 5+ min. This feels pretty plausible and good for gameplay. Tacking in 7 kts of wind is barely possible, and takes a long time but I didn't time it. Tacking in 5 kts does not seem doable.
Overall, seems very well-balanced at the moment.