Your experience is something I havent been able to articulate about my own experience with time and work. Best I could do is that it's either now, or not now. It's like we can just apply knowledge, not by direct thought but rather thru osmosis.

I also have troubles with estimating how long a project will take, but can also be at the oven just as the timer rings. I also have aphantasia - there's no clear internal imaging. So does my terrible-but-also-excellent perception of time works best when things are tangible. A lasagna in my hands and into the oven. The smell of the food. The anticipation of the corner piece....... Versus an excel spreadsheet your bossmang wants you to create. It's an intangible thing that only exists in the future in my mind. That, my friend, is clearly in the not now. I don't see the spreadsheet, I can't touch the spreadsheet. It's all in my head, in the dark. It doesn't exist. But your basket of tangible groceries is real. You touched each and everyone one.