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It can vary from almost immediate and up to 24 hours. In my experience it seems to help if you notify the recipient registrar soon after you have initiated the TAG change.
Tag changes will normal complete and the domain name transfer within 24 hours. However some registrars operate a "Handshake" system. With these the registrar you are moving to will need to accept the the change and these can take up to 5 days. You would need to check this with the registrar you are moving to.
If you have any concerns about the Tag change you can send me the domain or a support ticket ID and I will happily look into this for you.