Basically, I didn't bother calculating how much time they needed or how to get out, and I just threw it all together as is (so it would be easier for both me and you to understand what you're doing).
R - with random weapons.
N - with knives.
O - with one-handed weapons.
T - with two-handed weapons.
S - with a shield.
M - in robes.
The path to the left leads to Gaddar. The monks can be seen somewhere in the passage with the open doors. What's happening inside the church is not visible.