dm. Designated Marksman. military marksman role in a U.S. infantry squad. The DM's role is to supply rapid accurate fire on enemy targets at ranges up to 870 yds with a highly-accurate semi-automatic rifle equipped with a telescopic sight.he DM's role is to supply rapid accurate fire on enemy targets at ranges up to 870 yds with a highly-accurate semi-automatic rifle equipped with a telescopic sight.
The average person is awake for about 14 to 16 hours per day. Most could extend that to about 20 hours if they were to stay up later; up to 40 hours is easy once a person gets beyond the 24 hour mark; longer than 60 hours (staying awake straight through two nights and three days) is rare, but doable; the record is 264 hours or 11 days straight. Hannah Griffiths.
Best Answer: It's like.. 37 hours until your body starts merging into micro-sleeps. This is when you appear to be awake and your body just shuts down. Its dangerous because it can happen while your driving or doing other dangerous things. I wouldn't recommend 12 more hours.Atleast take a one hour nap.ow many hours can a person safely stay awake without long-term damage? I've been quite busy with work yesterday and today and have been awake for roughly 20 hours so far.