Do no such thing as staying outside for 3 hours. No need to.

LA2510 has indeed been affected by network delays impacting LAN's morning departure wave. While no one can give definite assurance and many many things can and do happen in the last minute in this industry, keep in mind that LAN's international departures from LIM are most of the time on schedule.

If you do end up getting delayed, all is not lost: there's a part-restaurant-part-bar across the hall from gate 19 that sports a smoking area. All you need to do is purchase a beer or a soft drink and you can stay for a couple of hours with no issues.