Transact SQL :: Repeating Customers Within A Timeframe

I'm trying to write a query which would bring back customers who are returning within a certain timeframe after their initial contact. Query 1 would be something like:

Select CustomerID, OrderID, StartDate, EndDate
FROM tblOrders

I would then like to bring back a recordset which showed any follow up orders within a timescale. Query 2:

Select CustomerID, OrderID, StartDate, EndDate
where EndDate is less than 6 months after Query1.EndDate
Joined by Query1.CustomerID = Query2.CustomerID

I haven't got as far as writing the T-SQL yet. I'm trying to think of a way to do it.