If you are looking to move MSG files to Thunderbird,  depends mainly on the number of files, their total size, and system performance. In most cases batch migration using tools like Aryson MSG File Converter can process a few hundred emails in several minutes while larger datasets containing thousands of MSG files may take anywhere from 10 to 60 minutes. Smaller transfers under 1,000 files are usually completed within 5 to 15 minutes if attachments are minimal and system resources are adequate Faster SSD storage and higher RAM can reduce processing time significantly The overall duration also depends on whether filtering or format conversion options are applied during migration as these add extra processing steps but ensure accurate email transfer into Thunderbird without data loss or corruption overall efficiency