SPF, Hotmail, and Yahoo mail

[Dave Smith]

Some alert readers may recall a discussion I started some time back 
trying to solve the mystery of why hotmail would drop my emails. Today I 
finally setup an SPF record for my domain hoping to solve the as yet 
unresolved problem. Does anyone know how long it ought to take hotmail 
to notice my SPF record? And more imprtantly: will it even make a 
difference?

According to dnsreport.com, the SPF record showed up immediately, but 
enterprisey services like hotmail tend to cache stuff like this I 
imagine. Thoughts?

--Dave