If today was the first time you played Lancer since 9 days ago, you weren't actually in fatigue today. Your SP/XP numbers just stay yellow until the first time you get SP/XP. Then they turn white.

Fatigue resets once per week. So even if you grind constantly for 2 weeks straight, you'll get out of fatigue once per week. Here's a YouTube vide on the fatigue system. (Link in text.)

The fatigue system is probably going away eventually, so this will eventually become a non-issue.