Two months. You'll read it a lot here, but patience and space are key. It took a lot of willpower for me not to send too many texts. I found that a lighthearted text once a week worked, nothing heavy whatsoever.
I also want to say that this gives them the opportunity to decide if they are willing to put in the effort to work on their condition and the time to reflect on whether they can handle the relationship. I think this is really key, and it's something that can take a while. The decision must come from within. If they are not ready, a relationship will be nearly impossible and pressure may be too much to bear.
It is frustrating, because during isolation you can't see what is going on, making the supporter impatient and susceptible to reacting badly, aggravating the situation. You just can't see or tell if they are making any steps to improve the quality of their lives. Give it time, if they are ready, you will hear from them. Sometimes doing nothing really is the best policy.