Direct answer
Standard trekking offers one hour with habituated gorillas; Uganda's habituation experience allows four hours with a semi-habituated group at roughly double the permit cost (0 vs ,500).
Recommended Uganda safari tours
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3 Day Uganda Gorilla Trekking Safari
You visit: Entebbe (Start), Bwindi Impenetrable National Park, Bwindi Impenetrable National Park, Entebbe
Uganda · Mountain gorillas · Bwindi focus
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You visit: Entebbe (Start), Kibale National Park, Bwindi Impenetrable National Park, Entebbe (End)
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6 Day Gorillas, Chimps & Wildlife
You visit: Entebbe (Start), Kibale Forest, Queen Elizabeth NP, Bwindi Impenetrable Forest
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You visit: Entebbe (Start), Murchison Falls NP, Kibale Forest, Queen Elizabeth NP
Uganda · Nile, chimps, wildlife & gorillas
3 Day Murchison Falls Safari
You visit: Entebbe (Start), Murchison Falls NP, Entebbe (End)
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10 Day Ultimate Uganda Safari
You visit: Entebbe (Start), Murchison Falls NP, Kibale Forest, Queen Elizabeth NP
Uganda · Extended flagship circuit