If you did ERP using this app, how long do you think it would take to get better?

Well, ERP really is different for everyone. It all depends on how you approach the sessions. It won't do you any good if you immediately do compulsions after it's over, that'll effectively wipe out all the work you did. But if you commit to cutting down on all your compulsions, including ruminating, you can expect to notice a difference very fast, sometimes by the next day (my experience)! I'm still not cured, and I've been at it on my own on and off for months, but I'm noticing a lot of relief very quickly when I really buckle down and take it seriously. It's hard to do, though, while I've done ERP I've had awful panic attacks, but if you stick the course long-term recovery is there. I would seriously recommend doing ERP under the supervision of a trained professional, though. If you do too much too soon you can scare yourself too bad and cause a relapse in compulsions. But if you think you can handle it/can't afford a therapist like me, I'd say go for it, but with a lot of care.

One OCD podcast I listen to believes that if you really commit to OCD recovery and ERP you can recover in 6 months. Me personally though, I think in some cases it might take longer. Each case of OCD is unique.

According to my therapist, it depends on a few things like severity and for how long you've been doing compulsions. In my case she thinks it's kind of severe but she thinks around a year?

No two people are the same, but if you actively do ERP....and stick to it regardless of how you feel the anxiety will fall naturally....Its not easy and there will be slips and trips along the way but as long as you keep moving forward I would say 6 months you will see a massive improvement....but you have to stick to the program no matter how much the anxiety tries to make you do compulsions to make you feel relief from ocd

True, it really depends on the person, and how much you put into wanting to heal

(For HOCD btw)

I also have HOCD, to give perspective.