It depends on the type of brown rice.
brown basmati rice, takes me 22-23 minutes....regular brown rice will take 45 minutes.
If it is boiled too fast, steam is lost and then the water measurement will change.
Lately I just make rice like pasta, I taste it to see if the texture and taste are right before I drain it. I boil water, add the rice, then taste it as it goes.
By this method, the white rice takes 14-16 minutes.
Using the pasta method, nutrition is lost and so is arsenic for rice grown in the southern US.
Using the exact measurement of water method, you don't lose anything.
If I was going to use the exact water method, I'd use 2 and 1/4th cups water to 1 cup brown rice. Bring it up to a boil, cover it and put it on the lowest heat, to steam it until it is done.
If at that point it is not done, 45 minutes later, water gone, add more water and continue to steam until done.
if it is soggy with 2 cups of water, use 1 and 3/4ths cups water next time, or turn up the heat and the steam will send off the remaining moisture.