DECLARE @Status tinyint, @Elapsed int, @Threshold int, @JobToCheck sysname

SET @JobToCheck = 'MyJobToCheck'
SET @Threshold = 60 * 1 /* Represented in seconds */

/* Assign varibles */
SELECT TOP 1 @Status = ISNULL(last_executed_step_id, 0)
	FROM msdb.dbo.sysjobactivity 
	WHERE job_id = (SELECT job_id from msdb.dbo.sysjobs WHERE name = @JobToCheck)
		AND (last_executed_step_id = 1 OR last_executed_step_id IS NULL) -->> This is NULL when first step of job is currently executing
	ORDER BY run_requested_date DESC

WHILE (@Status = 0)
BEGIN
/* Check job status, and elapsed time */
	SELECT TOP 1 @Status = ISNULL(last_executed_step_id, 0), 
		@Elapsed = DATEDIFF(second, start_execution_date, GETDATE())
	FROM msdb.dbo.sysjobactivity 
	WHERE job_id = (SELECT job_id from msdb.dbo.sysjobs WHERE name = @JobToCheck)
	ORDER BY run_requested_date DESC

	IF @Elapsed > @Threshold
	BEGIN
	/* Stop, then restart job for the step you want */
		EXECUTE msdb.dbo.sp_stop_job @job_name = @JobToCheck
		EXECUTE msdb.dbo.sp_start_job @JobToCheck, @step_name = 'Step you want to restart the job at'
		BREAK;
	END
	ELSE
	BEGIN
	/* Check every minute or so */
		WAITFOR DELAY '00:01:00'
	END	
END