How many entry and exit node combinations exist on the TOR network? Do the numbers change and increase regularly or are they more or less the same for years?
You can take a look at the data here:
https://metrics.torproject.org/networksize.html?start=2007-01-01&end=2021-11-08As you can see, the number of Tor relays has stayed fairly consistent at between 6000 and 7000 for the last 6+ years. Also note that when you use Tor, your browser picks one of three guard nodes, each with a lifetime of approximately 120 days. It is only the middle and exit nodes which change whenever you request a new circuit or after you've used the same circuit for 10 minutes. So given that you will be using the same guard node for a period of time, then you have around 6000-7000 possible entry/exit combinations.