The hours above are realistic ranges, not fixed commitments. They include everything I do for your account: daily checks, written reporting, calls, optimization, planning, in-depth auditing, strategic documentation.
On a quiet month — everything is running, just checks and incremental optimization — you're at the bottom of the range. On a month with problems (broken tracking, new campaign launch, account restructure, algorithm change) — you're at the top. On truly difficult months — I've gone over range.
I don't invoice extra above the range. The fixed fee includes the flexibility. If the real scope outgrows the agreed tier over time (for example, you started on Tier 1 but now have 4 platforms and 3 markets), then we renegotiate the tier. In writing before it happens.