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Dear English speakers out there, I have a question to ask.

I am preparing an essay for my linguistics class and I have some doubts about some verbs: being not a native speaker, I'd like to ask you if some of there sentences make sense or not.

Please note that I don't need you to rephrase them (e.g.: They consumed dinner in an hour): i need to know whether they are correct or not 1) They breakfasted for 10 minutes.

2) They breakfasted in 10 minutes.

3) They dined for an hour.

4) They dined an hour.

5) They snacked on junk food for three days.

6) They snacked on junk food in three days.

7) The cows grazed in the pasture for a month.

8) The cows grazed in 2 hours.

9) The herdsmen grazed the cows for a whole day.

10) The herdsmen grazed the cows in 2 hours.

And: does the verb "to lunch" (or "to lunch on") exists?

I can't find any concrete example, even "to dine (on)" and "to breakfast (on)" exist.

Thanks in advance!