The visibility timeframe for BIMI across email clients like Gmail and Yahoo is highly variable and depends on a multitude of factors. While Gmail might display BIMI logos within an hour of VMC publication (though DNS caching can extend this to 24-48 hours), Yahoo's display is contingent upon meeting their specific, sometimes inconsistent, criteria. Overall, DNS propagation, email client caching and policies, adherence to BIMI specifications, proper DNS configuration, email authentication (SPF, DKIM, DMARC), VMC validation, sender reputation, and implementation complexity all contribute to the variability. Immediate visibility is not guaranteed, and monitoring BIMI status across multiple email providers is crucial. Email volume is not a factor, but proper setup is.