Estimate Necessary Buffer Time

Help me estimate appropriate buffer times to build into my daily schedule. Consider these factors:
- Transitions between different types of tasks (e.g., creative work to analytical work).
- Potential for meetings to run over.
- Need for short breaks between focused work blocks (Pomodoro style).
- Unexpected small tasks or interruptions.
Based on common productivity principles, suggest reasonable buffer time percentages or specific durations (e.g., 5-15 mins) to add between [Example Task/Meeting Types, e.g., back-to-back meetings, complex project tasks, client calls].