Yes, 10 days is an ideal duration for a Tokyo-focused trip in 2026. This allows you to explore the major hubs (Shibuya, Shinjuku, and Ginza) at a leisurely pace without the "temple burnout" that often occurs on shorter trips. With 10 days, you can dedicate specific days to niche interests, such as a full day in Akihabara for gaming/anime, a day in Shimokitazawa for vintage shopping, and a day for the teamLab digital art museums. Most importantly, a 10-day stay gives you room for at least two "day trips" to nearby wonders like Mount Fuji (Lake Kawaguchi) or the historic shrines of Nikko. While you could easily spend a month in Tokyo and never get bored, 10 days provides the perfect balance of iconic sightseeing and deep-neighborhood exploration, ensuring you leave feeling like you’ve actually lived in the city rather than just rushed through it.