Just for other fellow GMs a few words about tJoY. First of all it is an EXCELLENT scenario - it offers a lot of options, doesn't rely on brute force and in short is very well written and enjoyable. There is a host of interesting NPCs, potential for further games and last but not least - the setting is perfect.
1)Time-frame. The whole scenario took us 5 games (averaging 5 hrs each). 1st - introduction, preliminary research of the auction members, shopping etc. 2nd - preparations continue and end with the race. 3rd - auction, slicing and the gem. 4,5th - dealing with the aftermath.
2)Power level - my group is about 600xp (a year of playing). So most major NPCs had to upgraded, usually by adding one proficiency die to key skills. I gave minions (especially Grayson's security) extra wounds, so they were tougher but their number stayed the same. Major changes in the racing teams - every racer had improved full throttle (otherwise the player pilot would win without any problems) and skills/attributes around 4. The cars had disabled main guns and used linked heavy repeater blasters instead. Otherwise one shot would destroy any racer. With new guns there was a strategy behind the extra armour/speed dilemma.
3)How it went? Time and keeping the track of time is crucial. I gave the players 3 days total until the race. This way they really had to choose what to do (I think Arend Shen would approve) and for example decided not to try to set up a false account of their own. Otherwise the heist preparations were an opportunity for some excellent gaming moments. For example they had an idea to kidnap and reprogram the droid working in the Gallery, so when the time was right it switched off the cameras in the museum. They raised the price to 260k, sliced the droid, convinced it to be quiet, got the gem - but not as quietly as they wanted and when facing Elaiza in a very star-warsy moment they decided to give her the gem in exchange for help in finding one PC's family.
They had no gem, no money and everyone was looking for them. Long story short, eventually they got out without any obligation, but without the gem or money. Shen survived, Grayson got arrested by Zekra Fol (thanks to the PCs), Aris is their friend (they saved her from Grayson), Lando let them go.
Well that's it! If you have any questions about the adventure, I'll be happy to help. Once again - it is an excellent scenario so if any authors are reading this - thank you! I'm waiting for more of your work.