Yes, like michev suggest above, the MaximumDurationInMinutes parameter specifies the maximum duration in minutes for meeting requests. A valid value is an integer from 0 through INT32 (2147483647). The default value is 1440 (24 hours).
You could use the command above to set for one specific mailbox, or setting for all room mailboxes in your organization
Get-Mailbox | where {$_.recipientTypeDetails -eq "roomMailbox"} | Set-CalendarProcessing -MaximumDurationInMinutes 14400
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