MS Access question

Sum fuction, could i use nn format? i need to convert it in minutes

SELECT [8 qMonthlyCallDurationInboundDetail].Date, Sum([8 qMonthlyCallDurationInboundDetail].Expr1) AS SumOfExpr1, Sum([8 qMonthlyCallDurationInboundDetail].Expr2) AS SumOfExpr2
FROM [8 qMonthlyCallDurationInboundDetail]
GROUP BY [8 qMonthlyCallDurationInboundDetail].Date;

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