Depends on encounters per day. And whether the druid is using their forms to fulfill tool positions for the party (mount, flying scout, tunneler, etc.).
My current Druid has to deal with 1, 2, or 3 encounters per day, and only one or two special rolls per day. At 14th level, with gear but no feats I have 8 wild shapes per day. So usually I have 3-4 uses remaining at the end of each day.
To put that in context for the campaign I'm in.[spoiler]
I am the only T1 in the party, as well as the only player with a high amount of game knowledge, I have not OPed my feat choices or anything else, and I am still playing my druid down to a painful extent. I am only playing one so that someone in the party isn't a beatstick and so someone can deal with being a multi-tool, but if I went Wis I would break this game, just because of the power-level (the others are T4-3).[/spoiler]