I've seen an article claiming the spike protein that causes heart inflammation has been detected up to 9 months later. This is different and I may be reading this wrong, but it sounds to me as if the issue might persist as long as the unnatural immunity does.

Reportedly, antigen clearance is correlated with the production of antigen-specific immunoglobulins or may remain in the circulation (e.g., in exosomes) for longer periods [47.,48.], providing one reasonable explanation (among others) for the robust and durable systemic immune responses found in vaccinated recipients [49.,50.]. Therefore, there is likely to be an extensive range of expected interactions between free-floating S protein/subunits/peptide fragments and ACE2 circulating in the blood (or lymph), or ACE2 expressed in cells from various tissues/organs (Figure 2) [14., 15., 16.]. This notion is further supported by the finding that in adenovirus-vectored vaccines (Box 2), the S protein produced upon vaccination has the native-like mimicry of SARS-CoV-2 S protein’s receptor binding functionality and prefusion structure
.... Additional interactions with human proteins in the circulation, or even the presentation to the immune system of S protein antigenic epitopes [52.] mimicking human proteins (molecular mimicry) may occur [53., 54., 55., 56.]. Citation 47: paper is on Monitoring serum spike protein with disposable photonic biosensors following SARS-CoV-2 vaccination.

https://www.cell.com/trends/molecular-medicine/fulltext/S1471-4914(22)00103-4#back-bb0250