I'm looking into moving my WordPress blog from an old domain to another domain that I own. The old domain is getting expensive at $25/year and I have to renew in a month. I had the old domain for 15 years but it no longer serves it's purpose as a standalone blog.
I have several options for handling this:
Leave it as is and keep paying the renewal registration.
I can do the move right now and let the registration expire next month.
Make the move and renew for another year before letting the registration expire.
How long do I need to keep the old domain up for the 301 redirects to be effective before I let the registration expire?