How long has the toy story character presence been at disneyland?

The available evidence does not include any mention of the presence of Toy Story characters at Disneyland, nor does it provide dates or durations for such appearances. Because the source material lacks any detail on Disneyland events, any claim about the length of time would be speculative and is therefore not supported. Without additional verified information, it is not possible to answer the question accurately. If you need precise data, additional research from official Disney or Toy Story sources would be required.