Use Query Monitor Plugin.
This will tell you how many Queries along with the time taken by each, at what place it was called along with stack trace.
It will even tell you time taken for page generation.
As others told, the number of queries is not the right parameter, but having anything over 100 would not be a good indicator in general.
The Plugin is free and licensed under
GNU General Public License.
To quote the author of the plugin:
Query Monitor focuses heavily on presenting its information in a useful manner. For example, aggregate database query information is made available, allowing you to quickly determine poorly performing plugins, themes, or functions. It adds an admin toolbar menu showing an overview of the current page, with complete data shown in a panel once you select a menu item.
For more information, please see: