The best location for a 30′ photoshoot is definitely Trocadero where we have an amazing view on the Eiffel Tower.
Usually I try to start the 30′ photo sessions about 3/4 hours after dawn so between 9h30 and 12h30 depending on the season, later in winter and earlier in summer.
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Trocadero is by large the best location for a quick photoshoot.
It offers amazing spots that can be used even if the location is really crowded.