Looking on the internet deeply has found these results:

He sat thinking is the most popular phrase on the web.

He sat thinking for some time 10 results on the web	He sat thinking 1646 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	Nov 7, 2012 ... ... two more battleground states on Tuesday, betting that one last visit might push him over the edge in the razor known sensations, a cramping of the breast, and a tingling of the soles of ... His eyes sparkled merrily and he smiled as he sat thinking. 'Yes, it was very nice. There were many other delightful things which I can't just get hold of — can't ... sharp contest, he sat thinking. Next day, he sat thinking of what he had undergone ; " all at once I thought I felt well sharp contest, he sat thinking. His eyes were closed, his chin resting on his clasped hands and his legs stretched out before him. Nov 7, 2012 ... ... in the razor

He sat thinking for some time

10 results on the web

He sat thinking

1646 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

Nov 7, 2012 ... ... two more battleground states on Tuesday, betting that one last visit might push him over the edge in the razor
known sensations, a cramping of the breast, and a tingling of the soles of ...
His eyes sparkled merrily and he smiled as he sat thinking. 'Yes, it was very nice. There were many other delightful things which I can't just get hold of — can't ...
sharp contest, he sat thinking.
Next day, he sat thinking of what he had undergone ; " all at once I thought I felt well
sharp contest, he sat thinking. His eyes were closed, his chin resting on his clasped hands and his legs stretched out before him.
Nov 7, 2012 ... ... in the razor