What is time in string/M-theory and Four-dimensionalism?

[kodama]

TL;DR

concept of time

what is time according to string/M-theory

do objects in string theory also have temporal parts?

and how does the debate of Three vs Four-dimensionalism apply to string theory which posits 10/11 dimensions?

 

[Baluncore]

What we experience as three spatial dimensions plus time, is the four dimensional spacetime of GR.

what is time according to string/M-theory
do objects in string theory also have temporal parts?

In string theory, spacetime is ten-dimensional (nine spatial dimensions, and one time dimension). In M-theory, spacetime is eleven-dimensional (ten spatial dimensions, and one time dimension).

... and how does the debate of Three vs Four-dimensionalism apply to string theory which posits 10/11 dimensions?

The extra 6/7 dimensions are hypothesised for mathematical consistency, and are not observed in experiments.