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If he has submitted his application for settlement (ie. spouses visa) and the application is currently pending then he need not worry about his current visa expiring before he hears back from the HO - he is permitted to stay until the decision on the spouses visa is received.
The HO aims to complete all applications within 6 months of the date the application is submitted so if it is less than 6 months then he should not worry unduly.
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