Days off per month - 17 days on, the remaining part of the month is off.
Btw trips - it really depends, varies from 5 to 14 days. If you string them together you can get more off. from last month to this, a little more than 3 weeks off for me.
Reserve - R-1 is home reserve. Simple version - Contact 0700-1200, 5 hours to nearest airport. Other times, 10 hours. Depending on the situation, they may owe you a ride to the airport too.
R-2 is hotel reserve and report time is 90 min after call. Hotel provided by company.
PM me if you have more questions or more details.