What's the probability of entering dust into DSLR while switching lens?

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denes5555 New Member • Posts: 9
What's the probability of entering dust into DSLR while switching lens?

Currently I have a Nikon D3400 with a 18-55 mm AF-P kit. I have never removed the lens, but I want to buy a telephoto lens.
I hesitate betwee the following combinations:
1. 18-55 mm + 55-200mm
2. 18-140 mm

If I chose the first option, I will change the lens sometimes. After how many switch will I notice dust on the sensor? (D3400 does not have built-in sensor cleaner.)

Nikon D3400
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