Everything else is bolting, but driveway choi is still going strong

We've had multiple days in the 80s, and a few in the 90s, over the last couple weeks and this guy is still just doing his thing. At what point do I get annoyed that my heat-resistant plant isn't bolting so that I can save seeds from it? 😂

All of my other choi are either bolting or have been growing rough, bumpy leaves from the heat, but this one keeps growing nice-looking greens regardless of what gets thrown at it.