Here's a query cobbled together from various sources that gives you a fair bit of info including report execution duration. If you've used a shared schedule then the schedule name is useful in combination with the report name. If you have one-off schedule settings then it will get the ugly GUID name.

select

U.UserName AS SubscriptionOwner,

cat.Path AS ReportPath,

S.EventType AS SubscriptionType,

S.DeliveryExtension AS DeliveryMethod,

Sc.Name AS ScheduleName,

Rs.ScheduleID

,cat.path

,cat.name

,CONVERT(nvarchar(10), min(ex.TimeStart), 103) as Earliest_run

,CONVERT(nvarchar(10), max(ex.TimeStart), 103) as Most_Recent_run

,sum(case when ex.Format = 'RPL' then 1 else 0 end) as OnScreen

,sum(case when ex.Format = 'EXCEL' then 1 else 0 end) as Excel

,sum(case when ex.Format = 'MHTML' then 1 else 0 end) as MHTML

,sum(case when ex.Format = 'PDF' then 1 else 0 end) as PDF

,sum(case when ex.Format = 'CSV' then 1 else 0 end) as CSV

,sum(case when ex.Format = 'HTML4.0' then 1 else 0 end) as HTML4

,sum(case when ex.Format = 'ATOM' then 1 else 0 end) as ATOM

,sum(case when ex.Format = 'IMAGE' then 1 else 0 end) as [IMAGE]

,sum(case when ex.Format = 'WORD' then 1 else 0 end) as WORD

,sum(case when ex.Format = 'XML' then 1 else 0 end) as [XML]

,sum(case when ex.Format NOT in

('EXCEL','MHTML','PDF','CSV','HTML4.0','RPL','ATOM','IMAGE','WORD','XML')

then 1 else 0 end) as Other

,AVG(Datediff(ms,ex.timestart,ex.timeend)/1000.0) as execution_duration_seconds_average,

Max(Datediff(ms,ex.timestart,ex.timeend)/1000.0)

- Min(Datediff(ms,ex.timestart,ex.timeend)/1000.0) as execution_duration_seconds_variance

,AVG(ByteCount) as Bytes

FROM ExecutionLog AS ex

INNER JOIN Catalog AS cat ON ex.ReportID = cat.ItemID

INNER JOIN Subscriptions S ONS.Report_OID = cat.ItemID

INNER JOINUsers U ON S.OwnerID = U.UserID

INNER JOIN ReportSchedule RS ONS.SubscriptionID = RS.SubscriptionID

INNER JOIN Schedule Sc ON RS.ScheduleID = Sc.ScheduleID

group by cat.path, cat.name, U.UserName,

cat.Path,

S.EventType,

S.DeliveryExtension,

Sc.Name,

Rs.ScheduleID

Order by sum(case when ex.Format = 'RPL' then 1 else 0 end) desc;