As much as it would cost a native app. Say, on Mac, a plain AppKit app consumes 16-17 MB, gea consumes 18-20 MB, Qt consumes 25-35 (depending on whether you use QML or not) and Tauri consumes 58-60 MB. Tauri suffers a lot from all the WebKit dependencies, as its UI is not native but rather HTML rendered by WebKit.
A windows native app can be a few kilobytes on disk and use only as much memory as you give to set the stack size, so you might have to use actual numbers. Native can mean a lot of things and be extremely minimal.
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