I don't think it is very rare. " These feel very natural and useful to me.
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pructusThen how about He is watching TV for 3 hours.?This is possible in theory if the activity is ongoing and it is known that it will last for three hours (it doesn't mean that three hours has elapsed). In reality it would be a pretty unusual thing to say though.
pructusI remember coming across the clause, I am being a do
GPY In reality it would be a pretty unusual thing to say though.Just to be clear, I'm not saying that the grammatical pattern would be unusual in every case, just that it seems unusual in the specific example given.