Hello guys.
So, I'm gonna run a quick Dark Sun adventure using Pathfinder Rules. Although I've built pregens, monsters and NPCs using the core rulebooks and the awesome resources from Dreamscarred Press, I'm stuck with quite a relevant problem: a quick way to handle journeys through the athasian desert. Now, the average temperature in the desert during the day is 110 Fahrenheit degrees (about 43 Celsius), often reaching 130° F (54° C). The core rulebook suggests a Fortitude Save every 10 minutes for temperatures above 110° F (DC 15+1 per previous save) or take 1d4 nonlethal damage. Honestly, having my whole party roll 6 saves per hour would slow things a bit too much. On the other hand, the book suggests a roll every hour for heat from 90° F to 110° F.
To speed things up, I thought that, given athasian people are more accustomed to this environment than creatures from other planes/worlds, I could use the once per hour roll for travel during the day (from 5 am to 8 pm). Characters can use their Survival skill to boost their saves as usual in the morning. During the night (from 9 pm to 4 pm), temperatures drastically drop to about 46° F (8° C), so there's no need to make any checks I guess.
I still have some doubts concerning the checks' DC (15 or more?), and the amount of nonlethal damage suffered (1d4 or more?). Please let me know your thoughts on this.