How to pronounce“spacetimes”in English

Maybe we're going to be interested in three-dimensional space times or two-dimensional spaces or 20-dimensional spacetimes.

the cosmological realm that is generated by this process called eternal inflation is true then there are multiple spacetimes. There is the bulk spacetime and I don't want to use that word bulk

So Einstein being Einstein undertook to learn what we now call differential geometry, the non-Euclidean geometry of curved spacetimes.