Using Listen andDelay Shape

Hi,

I am new to BizTalk and .Net.
I am trying to develop a Batching scenario, using correlations. Here I have a Loop in which I have a delay shape.

                 Loop(till flag == true)   
    
                    Listen Shape

       ——————————————–
       |                                          |
       |                                          |
       |                                          |

   1. Receive                               1. Delay Shape
      Subsequent Orders
                                               
   2. Append Nodes to                  2. Set flag = false  
      create an Envelope
      Nodes.
 
   3. Do some other
      operations
      
       |                                          |
       ——————————————–
                         |
               Send Batched Message

I am having a problem in setting values for Delay Shape. It allows me TimeSpan/DateTime.
I would want to set a condition Collect all the Orders till 9 pm everyday and batch them.

 I have been trying to set values using datetime(,,,) , but unsuccessful as I am not able to ignore the years(0-is invalid input),months etc component.

  And I wouldnt prefer using TimeSpan (1day,0,0,0) as I assume delay is the delay time after the Orchestration is initiated –
  Reason for my concern is in case of Day 1 – i get the orders and batch them. But on Day 2 from 9 pm to 9:30 pm no order is received
  and if I receive the first order at 9:30pm, my delay shape would lead to the orchestration running till 9:30 pm on day 3
  (please correct me if i am wrong).

 Please suggest me a way as I way I could put the condition in the delay shape to wait only till 9 pm (x hrs y min).

 Or another method I could use is by using the DECIDE shape and check for the condition (datetime.now.hours == 9 )
 and the same steps to be followed.
 But I am not sure if its a very efficient method as I am checking for the condition every time the loop executes.

 Please suggest me the right approach. Thanks in advance.