Some quick questions, for if someone knows:
1 - What affects the length of time you spend jumping? Some of my jumps were really, really long.
2 - Is it possible to use Heat Sinks in supercruise?
3 - Just how crazy are those among you who have done this more than once!
1. As Takaru Minari said, witchspace is essentially a loading screen for your machine to do the procedural generation of the system you're jumping to; this means that for the most part it's down to the specs of your machine and, to a lesser degree, internet connection. There
is one interesting caveat, however: if you're the first person to ever enter that system, some server-side work also has to go on before you can load into the system. If the FD servers are under heavy load, this can take some time. I've had some transitions take about 90 seconds when it'd normally be 10-15, only to jump into a pretty normal system; my theory for that is that my system's server-side generation was stuck in a queue on an overloaded server somewhere.
2. Afraid not

3. My answer would have to be "not as crazy as the guy who did it in a Sidewinder, only to decide that
that wasn't slow enough."

(Although he came impressively close to it not being slower at all!)
I waited about 12 days so far, what time would you estimate for the bumper sticker to cross the ocean and reach Europe?
Hm, that sounds like a long time... Mine was probably in the region of 4-5 days I guess. Give EZ a shout when he's back, in the unlikely event that his inbox isn't already overflowing
One final thing... I'm speculatively intending to do another Anaconda run this weekend, with the 7A fuel scoop I can now afford. My main reasoning for this is that it will be cheaper for me to do the run now, get to the far end, blow myself up and sell the scoop after a rebuy, than it will be to just remove the scoop after 1.3 hits.

(It's speculative because I haven't told the other half yet... heheh.)