MX records and changing a mail server

We send and receive email from around the world.

We are in the process of changing our MX records however..... I am not positive when ( some time in the next month ).  

I know a little about changing the time to live for mx records and am not sure I want to go from 24 hours to one second in just one step.  I am looking for an logical TTL that will keep us running in mail around the world but is not a 24 our setting.  It would be a setting that some people run on a daily basis.  

My top candidates for time to live are 2 hours, or 1 hour.  

How would you step the time down ?  

24 hours, 2 hours, 1 hour, 1 second ?

24 hours, 1 second ?

We are running Gmail
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Jan SpringerCommented:
I would step down from 24 hours to 30 minutes and the day before the move, change it to 5 minutes.  

Once the change is complete, set it back to 24 hours.
TIMFOX123Author Commented:
Hello Jan

I researched this also with other "pros" we have at our disposal.  This is a great answer " A three step " change  is what I am going to do.

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