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By setting a timeout value, in seconds, you can specify that once the plugin has spent that many seconds drawing features then it should stop, regardless of how many it has drawn. Currently, the default is 10 seconds. As of Weave 2.5.28, it's possible to add a 's' or 'ms' suffix to the timeout value to specify if the units are seconds or milliseconds, e.g. <timeout>500ms</timeout>.
By setting a limit value you can specify that the plugin should draw a maximum of that many features. There is no default value.
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