Sub-interfaces on a SRX 240h

I am a novice on the juniper firewall (SRX 240h). I have a working production juniper running 10 Vlans, I would like to add a few more Vlans. I have a couple of questions I hope someone can help me with, concerning the interfaces. How many sub-interfaces can you have? Is there a limit?

Here is a sampling of our interfaces with the Vlans:

set vlans Pod-1 vlan-id 100
set vlans Pod-1 interface ge-0/0/1.0
set vlans Pod-1 l3-interface vlan.100
set vlans Pod-2 vlan-id 200
set vlans Pod-2 interface ge-0/0/2.0
set vlans Pod-2 l3-interface vlan.200
set vlans Pod-3 vlan-id 300
set vlans Pod-3 interface ge-0/0/3.0
set vlans Pod-3 l3-interface vlan.300
set vlans Pod-4 vlan-id 400
set vlans Pod-4 interface ge-0/0/4.0
set vlans Pod-4 l3-interface vlan.400
set vlans Servers vlan-id 600
set vlans Servers interface ge-0/0/6.0
set vlans Servers l3-interface vlan.600
set vlans WAP vlan-id 500
set vlans WAP interface ge-0/0/5.0
set vlans WAP l3-interface vlan.500

If I were to add another Vlan could this work? 

• set vlans VehicleCompliance vlan-id 210
  set vlans VehicleCompliance interface ge-0/0/2.1
  set vlans VehicleCompliance l3-interface vlan.210
  set vlans DeckNew vlan-id 220
  set vlans DeckNew interface ge-0/0/2.2
  set vlans DeckNew l3-interface vlan.220

Or should the interface stay at ge-0/0/2.0?