Exchange 2007 to Exchange 2013 migration

Hello, I am trying to estimate a job for this migration going from Exchange Server 2007 to 2013 with 70 users. I'm trying to figure out how many hours it will take to move the mailboxes, This is a new client, so not sure how big they are, but I assume they are large. Anything from educated guess' to prior experience would be helpful.
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Well, regardless of the number of users, current mailbox size is what you need to use in order to help determine the amount of time it will take.
Get-Mailbox | Get-MailboxStatistics |  select-object DisplayName, {$_.TotalItemSize.Value.ToMB()}

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I used the tutorial here when I did my migration.  In part 2, the author discusses using the Exchange Environment Report Script in order to gather statistics about your current culture.

Most likely, though, you would probably be able to move your environment (mailbox item count, mailbox size and network speed allowing) over a weekend.


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creativenetworksAuthor Commented:
Thanks, that's what I thought, I will estimate it on the high side. I'll check out the article, seems to be more in depth than the one I was reading.
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