Problem With Query, Looking For An Expert Solution

hello My SP is as follows


CREATE PROCEDURE SP_ProcessAdminResults(@UserID nvarchar(100)) As

Declare @ReqID as integer;
Declare @Assaignee as integer;
Declare @TechName as nvarchar(200);
Declare @OpenDate as datetime;
Declare @GroupID as integer;
Declare @DateActiontaken as datetime;
Declare @AssignedDate as datetime;
Declare @ActionDays as integer;
Declare @OpenDays as integer;

declare GroupCursor cursor local scroll static for select [ReqID],[Assignee],FullName,[OpenDate],[GroupID],[DateActionTaken] from V_ProcessRequestMaster where UserID=@UserID and [Status]<>'CL' order by ReqID
open GroupCursor
fetch first from GroupCursor into @ReqID,@Assaignee,@TechName,@OpenDate,@GroupID,@Da teActiontaken
while (@@fetch_status <>-1)
begin
select @AssignedDate= min(DateLogged) from LOGMASTER where
analyst=@Assaignee and reqMasterID=@ReqID and UserID=@UserID and Type='INIT'
If @AssignedDate is null
Begin
select @AssignedDate=dbo.GetActionDate(LTRIM(Rtrim(@TechN ame)),@ReqID,@UserID)
End

If @AssignedDate is null
BEGIN
set @ActionDays=0
END
Else
BEGIN
If @GroupID=438030
BEGIN
set @ActionDays=[dbo].GetBussinessdays(@AssignedDate,@DateActiontaken,5 ,6)
set @OpenDays=[dbo].GetBussinessdays(@OpenDate,getdate(),5,6)
END
Else
BEGIN
set @ActionDays=[dbo].GetBussinessdays(@AssignedDate,@DateActiontaken,1 ,7)
set @OpenDays=[dbo].GetBussinessdays(@OpenDate,getdate(),1,7)
END

END
If @ActionDays<>0 set @ActionDays=@ActionDays-1
If @OpenDays<>0 set @OpenDays=@OpenDays-1

update requestmaster set DateAssigned=@AssignedDate, ActionDays=@ActionDays, OpenDays=@OpenDays where ReqID=@ReqID and UserID=@UserID
fetch next from GroupCursor into @ReqID,@Assaignee,@TechName,@OpenDate,@GroupID,@Da teActiontaken
end
GO


The master table contains like 600,000 odd records and when i put a cursor and process the results where i need to get the business days between assigned date and action taken date the query take lot of time and eventually the front end crashes saying Time OUT expired.

Looking for an expert solution to simplify that query.