2020 Return filed in Oct, Still Waiting

I filed Oct5 2021 for 2020 Tax return and on the IRS site under "Refund Status" even after entering all the data including the refund amount, it comes up with nothing. I tried calling IRS and now they don't even let you stay on hold, asking you to call next day.. Is it normal to take this long to refund? I wonder if they even got my certified mailed return.. Anyone else waiting this long?