how long should btrfs fi balance take?

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# btrfs filesystem df /
Data: total=101.57GB, used=75.75GB
System, DUP: total=8.00MB, used=24.00KB
System: total=4.00MB, used=0.00
Metadata, DUP: total=3.00GB, used=2.09GB
Metadata: total=8.00MB, used=0.00
# btrfs filesystem df /
Data: total=100.57GB, used=77.00GB
System, DUP: total=8.00MB, used=24.00KB
System: total=4.00MB, used=0.00
Metadata, DUP: total=3.50GB, used=2.35GB
Metadata: total=8.00MB, used=0.00

I've had btrfs filesystem balance running on a partition of my 120G Intel SSD 
for almost 7 hours.  The above two runs of fi df were before the balance and 
after it had run for almost 7 hours.  The system is in operation during this 
process, I've used it for email, web browsing, and I downloaded a movie from 
Youtube.

Also during the process the usual cron jobs have been running including the 
one that makes a snapshot of /home every 15 minutes.

Is it considered to be a bad idea to make snapshots while doing a balance?

Should a balance take so long anyway?  It's been mostly CPU bound an on E4600 
CPU, that's a bit dated but it's still dual-core 64bit and whatever the btrfs 
utility has done to use 327 minutes of CPU time is probably wrong.

Any suggestions on other information I should provide?  I'm using 3.10.7 in 
Debian package linux-image-3.10-2-amd64 version 3.10.7-1 and version 
0.19+20130705-1 of the btrfs-tools in Debian/Unstable.

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