Works like a charm, let me share the last code I end up with, and thanks to your input my reports will be easier to run, below the code in case it helps someone else.
I've added MTTR Long for reports, and MTTR minutes in case it needs to be used for calculation, also added the customers company name.
much appreciated gbruneau
select
CR.id,
CR.ref_num as 'Ticket',
CR.summary as 'Summary',
CR.description as 'Ticket Description',
LG.action_desc as 'Log Description',
CR.status as 'Ticket Status',
LG.type as 'Log Filter',
dateadd(S,cr.open_date,'19700101') as "Open_Date",
dateadd(S,cr.resolve_date,'19700101') as "Resolved_Date",
CONCAT (' Días: ', datediff(DAY,dateadd(S,cr.open_date,'19700101'),dateadd(S,cr.resolve_date,'19700101')),
' Hrs: ', datediff(HOUR,dateadd(S,cr.open_date,'19700101'),dateadd(S,cr.resolve_date,'19700101')),
' Mins: ', datediff(MINUTE,dateadd(S,cr.open_date,'19700101'),dateadd(S,cr.resolve_date,'19700101')),
' Sec: ', datediff(SECOND,dateadd(S,cr.open_date,'19700101'),dateadd(S,cr.resolve_date,'19700101'))) as 'MTTR Long',
datediff(MINUTE,dateadd(S,cr.open_date,'19700101'),dateadd(S,cr.resolve_date,'19700101')) as 'MTTR Mins',
(CUS.first_name + ' ' + CUS.last_name) as 'Affected End User',
Vr.organization as 'Organizacion',
(ANALYST.first_name + ' ' + ANALYST.last_name) as analyst,
GRP.last_name as 'Group',
CR.zsolucion
--CR.customer
from act_log LG
join call_req CR
on LG.call_req_id = CR.persid
join ca_contact GRP
on CR.group_id = GRP.contact_uuid
inner join ca_contact ANALYST
on LG.analyst = ANALYST.contact_uuid
inner join ca_contact CUS
on cr.customer = CUS.contact_uuid
inner join View_Contact_Full Vr
on Cr.customer = Vr.contact_uuid
where LG.type = 'RE'