Direct answer

How many days you need in Uttarakhand depends on what you want to see. Typical recommendations:

• 3–4 days: short trip (Mussoorie or Nainital or Haridwar/Rishikesh)
• 7–10 days: good highlights (Haridwar/Rishikesh + Mussoorie or Nainital + Jim Corbett or Corbett + Kumaon/Kumaon loop)
• 10–14 days: thorough Uttarakhand (Garhwal temples/treks: Kedarnath/Badrinath or Valley of Flowers + Kumaon lakes and hill stations)
• 2+ weeks: in-depth exploration including remote treks (Roopkund, Kuari Pass), multiple national parks, and cultural sites

Supporting details and sample itineraries

• 3–4 days (weekend):

  • Option A: Delhi → Mussoorie (2 nights) → Kempty Falls, Mall Road
  • Option B: Delhi → Nainital (2–3 nights) → Naini Lake, Snow View
  • Option C: Haridwar/Rishikesh (overnight Ganga aarti, rafting, yoga)

• 7–10 days (best for first-time visitors):

  • Route 1 (Garhwal highlights): Delhi → Haridwar/Rishikesh (1–2 nights) → Mussoorie (2 nights) → Auli or Joshimath/Kedarnath approach (2–3 nights)
  • Route 2 (Kumaon + Corbett): Delhi → Jim Corbett (2 nights) → Nainital (2 nights) → Almora/Kausani (2 nights)

• 10–14 days (trek + culture + nature):

  • Valley of Flowers + Hemkund Sahib trek (4–5 days) + Badrinath visit + Rishikesh/Haridwar (2 days) + Kumaon lakes (Nainital/Almora, 3–4 days)
  • Or combine Corbett safari, Nainital, and Garhwal pilgrimage circuit

• 2+ weeks (adventure and remote areas):

  • Include long treks (Roopkund, Kuari Pass), high-altitude lakes, remote villages, multiple national parks, and buffer days for acclimatization and travel delays.

Practical tips

• Season matters: best times: Apr–Jun and Sep–Nov. Monsoon (Jul–Aug) brings landslides; winters can close high passes (Nov–Mar).
• Travel times: hilly roads are slow—expect 6–8 hours for 150–200 km in mountains.
• Permits: some treks/areas require permits (Valley of Flowers, certain border areas). Check locally.
• Altitude: include acclimatization days for trips above ~3,000 m (Hemkund, Kedarnath approaches).
• Wildlife: book Corbett safaris in advance, and choose guided treks for safety.

If you tell me which places you want to visit (e.g., Mussoorie, Nainital, Rishikesh, Kedarnath, Valley of Flowers, Corbett), I can draft a day-by-day itinerary for the ideal number of days.