Hey, right here what I found.

30 Minutes Best Working
I made 1.27k gralats from Speedy Pizza for 6pm at Night. 944 gralats on Digging but depends on ranges/average. Note: Doesn't matter to earn a lot gralats per day. Only Sunday to Thursday for 6pm Tonight.

Worst Working on the Job
Car Mission- Slow Earn Gralats when players a lot during a mission for all day long. Some Players are dying from during mission by pking, It must be recommend to wear Gas Mask, Full Hp and Homeless Witch Shield(If u have)