covid shortness of breath and dropping oxygen level.

My father (78M) was infected with covid around 2 weeks ago. At first, we thought his fever and weakness were just common cold and it would heal. But when he started getting dizzy , we took him to the hospital. Doc said said he had low oxygen and high sugar levels. He got tested positive for covid and was kept in the hospital for a week where he got better, then we had to take him home because he made a huge fuss since he hates hospitals and feels very uncomfortable staying there. Doc said his oxygen level drops without an oxygen mask, so after much effort , we got him an oxygen concentrator. 1 week later, he has no fever and probably no other symptoms except for shortness of breath and low oxygen level. At first, he could stay 1 hour+ until his oxygen level drops to 80s, but now he's always on the concentrator. He doesn't say it, but i can tell he doesn't sleep much at night and sometimes his voice is hoarse during the day, his respiratory rate is around 24-27 bpm, and i don't know how long it will take for him to heal (if it will). He's taking enoxaparin 40mg and we're always checking his pulse ( usually jumps between high 80s and 90-95 with concentrator) and his sugar levels. Is there any estimates to how long this shortness of breath and dropping oxygen level can last for? few weeks? specially since we could only rent an oxygen concentrator and don't think we can keep it for long. Is there anything else i can do??

Thank you in advance.

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