How long can I stay on my first US touist visit?

[okllee]

I want to visit my girlfriend in the US on the tourist visa and have very strong ties to UAE and India. I'm hoping to stay 2-4 months in the US this year on the tourist visa.

However, I've heard that you should only stay for 2-3 weeks on your first visit and ramp it up from there. How long can I stay on my first visit without being told no?

Thank you for your help