I'm almost certain all the main 12 (?) internet name servers update close to real time now.. the only "propogation" you need to worry about is ISPs with old cache data.. but I suspect with the instant DNS updates now, most ISPs will be refeshing their cached data faster than we have been used to as well..
If its a new domain, thats not been online, I am fairly certain there is no "propogation" time to worry about anymore... I bet a google search for "dns propogation" would turn up LOTS of results too.. seen this question asked many times in last few months.
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