Policy
Set the time-out interval for Outlook people search
This policy setting controls the time-out interval of Outlook people search. Outlook returns as many people search results as possible before the time-out interval lapses. If the search results are incomplete, Outlook displays a message at the bottom of the results list. If you enable this policy setting, you can specify the time-out interval in milliseconds. If you disable or do not configure this policy setting, the time-out interval is 60,000 milliseconds (60 seconds).
bd709989f099 L_SpecifyOutlookPeopleSearchTimeout Registry
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HKCU\software\policies\microsoft\office\16.0\common\im\presencecontactfastsearchtimeoutPolicy notes
This policy setting controls the time-out interval of Outlook people search. Outlook returns as many people search results as possible before the time-out interval lapses. If the search results are incomplete, Outlook displays a message at the bottom of the results list. If you enable this policy setting, you can specify the time-out interval in milliseconds. If you disable or do not configure this policy setting, the time-out interval is 60,000 milliseconds (60 seconds).