The meta type needs to be set as numeric.
'type' => 'numeric',
The full Query:
Array
(
[post_type] => post
[posts_per_page] => 45
[paged] => 0
[orderby] => modified
[meta_query] => Array
(
[0] => Array
(
[key] => duration
[value] => 30
[type] => 'numeric';
[compare] => >=
)
)
);
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