The recommended dosage of glutamine is 5-10g pre workout, post workout and before bed.
What is your reason for using the glutamine? It's a pretty old school supplement that is really over rated and over hyped.
Glutamine is great for gut health and immune function but it won't do a whole lot for muscle recovery.
BCAAs are a much better choice. The branch chained amino acid L-leucine directly signals protein synthesis through the mtor pathway. The branch chained amino acids are also extremely anti-catabolic which makes them great to take before cardio, especially when doing fasted cardio.
Just make sure to read the ingredients carefully because a lot of the flavoured BCAA products on the market have a lot of added sugar and carbohydrates per serving. This will blunt the fat loss response that you would of gotten from the cardio other wise. I personally use the capsulated BCAA product gear from n2bm.com.
http://needtobuildmuscle.com/store/Proteins/GEAR-p149.html