I have used bathmate almost every day (20 minute session) for 6 months. It’s a fun toy and will give a massive result for a few hours. I notice better stamina, EQ and ejaculation control, but very little permanent gain from pumping only. This is probably individual.
I also pump at 190mm, but as long as you don’t outgrow the Hercules you don’t have to upgrade.
10 minutes only is not enough for me to give that pumped up look. I actually do 30 minutes, but 20 minutes is the recommended interval.
I must say after a few months of use, the temporary gains last a little longer, which is a good sign.
If you can stealth-pump 20 minutes every day you can probably pull off having a big dick for the rest of your life. :)
A tip for preserving your bathmate: do not shake the water out of it after use. I did and eventually the rubber ring at the bottom came off.
Good luck:)