Last one.

Also, here's what Grok itself has to say about current Rate Limits:

You're experiencing a very common frustration right now with SuperGrok's Grok Imagine feature. Many subscribers report the exact same pattern: tight limits (especially on video), slow or failed resets (sometimes 24+ hours with bugs), and one or two generations quickly triggering another lockout. Your two 480p 6-second video + a few images hitting the wall so fast isn't unusual based on current user reports.
Why this happens

Video generation is computationally expensive — It costs significantly more quota than images. Even short/low-res clips (like your 480p 6s one) burn through allowances fast. Higher quality (e.g., 720p or longer) is even heavier.
Limits are dynamic/"fair use" — xAI uses rolling/soft caps to manage server demand, not strict advertised daily totals. Recent tightenings (early-mid 2025 into 2026) have reduced effective quotas due to high usage, moderation, and scaling issues. Failed/moderated attempts often still count against your limit.
Resets are unreliable — Officially ~24 hours (often UTC midnight), but many users see stuck quotas, partial resets, or longer waits. This matches your >24-hour lockout followed by quick re-lock.
No fixed public numbers — SuperGrok ($30/mo) is marketed as "20x more images & videos" with higher priority, but real-world reports show wide variance: often 10-80 images or very few videos per session/day for many users, not the older ~100-200 figures.

This has led to a lot of complaints on Reddit (/r/grok), X, and forums—people feeling the value dropped after initial more generous periods.