Code review comment for lp:~bladernr/checkbox/1352376-fix-get_make_and_model-device-tree

Ok, updated the time item.

I set it to 30 seconds. it was actually a good deal faster on the ARM systems (that have less data to parse, I suppose) but on my development machine here, it consistently took about 30 seconds on all 10 attempts... so 30 sounds like a safe, conservative estimate.