I've always wondered, when do you round up (or down) for orders of magnitude? For instance, is 6 close enough to 10 to say it's an order of magnitude larger, or does it need to be closer (say 8), or hit a hard floor of being at least 10 times larger before we colloquially say it's increased by an order of magnitude?

Completely ignoring the time variable, I don't think it's crazy to say something 6x bigger is an order of magnitude bigger. I'm curious what other people consider a cutoff for this though.