ICriteria criteria = session.CreateCriteria<TimesheetEntry>()
.CreateAlias("Employee", "e")
.CreateAlias("Employee.Payroll", "p")
.SetFetchMode("Gang", FetchMode.Eager)
.SetFetchMode("JobTitle", FetchMode.Eager)
.SetFetchMode("JobTitle.JobGrade", FetchMode.Eager)
.Add(Restrictions.Eq("Status", status))
.Add(Restrictions.In("p.ImportReference", payrollIds))

//Now we need to specify the from and to dates for each of the payrolls in payrollIds
=====================================================
.SetFirstResult((page - 1) * pageSize)
.SetMaxResults(pageSize);

//How do we achieve that.

//Any help is appreciated

Although we also have a NHibernate forum, I think this Google Group is more active and you should post your question there.