Time-Blocked Schedule Planner

Help me create a time-blocked schedule for tomorrow based on my to-do list. Here are my tasks:

[PASTE YOUR TO-DO LIST HERE]

Additional context:
- My working hours are [e.g., 9am-5pm]
- I'm most focused and energetic in the [morning/afternoon/evening]
- I need approximately [X] minutes for lunch and [Y] minutes for breaks
- These meetings are already scheduled: [list any fixed commitments]

Please create a realistic hour-by-hour schedule that:
1. Allocates appropriate time blocks for each task based on complexity
2. Groups similar tasks together to minimize context switching
3. Places high-focus tasks during my peak energy periods
4. Includes buffer time between activities
5. Accounts for my existing commitments
6. Includes short breaks to maintain energy and focus

Also, please suggest a contingency plan if things take longer than expected.