Is there any way to measure how much stored value is in Ripple at any given moment?

I read that that people who are risk averse won't store cash in Ripple for long periods of time, and will redeem their IOUs right away. Since the nature of transactions are "pay later" that makes me ask the following questions

• How many IOUs (outstanding debt) has been issued at a given time? (stored value)

• What is the average duration of a transaction (network wide, per gateway, etc)

How can I query for this data in raw format (or graphically)?

Is there any way to measure how much stored value is in Ripple at any given moment?

I read that that people who are risk averse won't store cash in Ripple for long periods of time, and will redeem their IOUs right away. Since the nature of transactions is for someone to "pay later" that makes me think there will always be stored value in the system. Based on that:

• How many IOUs (outstanding debt) has been issued at a given time? (stored value)

• What is the average duration of a transaction (network wide, per gateway, etc)

How can I query for this data in raw format (or graphically)?