leveling up!

[Peregrine]

Xatch has all the info you need.
Your alternative to leve groups every 36 hours is 5 man field parties on SPECIFIC mobs. Any more and your kills per minute don't make up for your sp per kill nerf by adding more players. 4 dds and a healer is optimal. If your party is absolutely raging, 3 dds and a healer will probably be the final "ultimate" field sp (until the system is overhaulled and we have to learn it all again)

8-15 levels over you is the appropriate range.
Efts, eyes, peistes, raptors are your bread and butter enemies that give the most stock sp because of their type.

The primary factor in your field sp success is mob density and mob spawn rate. Dungeons are preferred to field enemies, but there are no high-level dungeons yet.

Two-man parties can get away with chaining low-hp low-sp mobs quickly, but I don't recommend it past R30. There just isn't enough density and spawn rate opportunities for those mobs, and it's a lot of wasted running.