>>529578901
>yeah bro that won't take all of 40 hours to sit and do
It really didn't take long, since you're allowed to be incestual with no penalties.
Step 1: borrow some whale's 7 Speed Spark with good grandparents as a parent by paying him 1,000 coins to breed his horsepussy
Step 2: Use one of your own horses with shitty grandparents BUT it has at least 2 speed sparks itself
Step 3: get a resulting horse with at least 1 or 2 speed sparks, NOW you use THIS one as your inheritance
The Inspiration tracking only goes back one generation, and you can inbreed with no penalties, so as long as you get a single horse with 2* speed sparks you can brute force 7* speed inheritance by borrowing a whale's horse and then also using a horse bred from that whale.

As an example, here's my breeding Bakushin. I got an Empress with 2* speed sparks but dogshit parents herself, borrowed a whale's mcqueen and then ended up with 7 speed sparks. The fact that my Empress's grandparents are dogshit with no speed is now irrelevant, since it only tracks back one generation. Now I take this Bakushin with 7 Speed sparks, and I can breed it with that same whale's mcqueen to end up with 15 speed sparks total