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Great. How long do you think I'll need to wait until I hear back from them?
Is there anything that I can do at this point?
The pattern I have observed is that they will send you a LOR request around two weeks after you have paid your fee; then the LOR received email ten days later. Then two to four weeks later, an interview invite.
There is nothing you can do at this point, assuming you have already submitted your LOR's.