Roof support length?

I noticed this support in a roof this afternoon. The house was built in 2011 in a new subdivision where the houses are 10 ft apart. I’ve seen this type of support before and always presumed that it was an initial support used when constructing the roof. Am I way off on this? Also, if this is a required component; what’s the maximum length? The one I saw today was 16 ft tall. Any advice would be appreciated.

Tony106_8247 106_8248

Temporary to hold up the ridge with the few startup rafter install.

Outstanding; thanks a bunch for the quick feedback!! I’ve had to hit the forum a bit the past couple of weeks. I normally do my own research but I’ve been snowed under with reports. I really do appreciate all you who’ve helped me out. Thanks again!

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