How long does it take for hcg to return to 0?

Jackie • wife | mama x 3 | life luvah | 🌈 due 1•1•2020
I had an early miscarriage (4 weeks) that began on Thursday. Today I'm clear from any blood so I decided to take a hpt to make sure my levels are decreasing. There was still a vvvvvvfl. I know I'm no longer pg, just thought it would be clearly negative by now. The last beta I had was a week ago and my number was 53. How long will the hcg continue to linger? I'd like to start trying again...