delete query with large data taking too long in sql server

Try to split task in small pieces as:

DELETE TOP (10) YourTable WHERE col in ('1','2','3','7')
WHILE @@rowcount > 0
    BEGINE
    DELETE TOP (10) YourTable where col in ('1','2','3','7')
    END

Also, try following steps to increase perfomance:

--Disable CONSTRAINT
ALTER TABLE YourTableName NOCHECK CONSTRAINT ALL;

--Disable Index
ALTER INDEX ALL ON YourTableName DISABLE;

--Rebuild Index
ALTER INDEX ALL ON YourTableName REBUILD;

--Enable CONSTRAINT
ALTER TABLE YourTableName CHECK CONSTRAINT ALL;

--Delete again