It's been a long time since I went to Canada
Does the above sentence mean: since first or last went to Canada?
When you as a native speaker hear the above and below sentences, could you give me probabilities (by a sample of number of visits ) on the difference between those two sentences? This is of course if the first sentence has the meaning: first went to Canada
It's been a long time since I have been to Canada
If you feel it is better to change a long time into e.g. 5 years to make your answer clearer, then please do so.