dr-m dr-m ‘turn by turn’ (SD 37). Sabaic words do not refer to a long time period (”eternity”) and may rather represent a different, independent derivation from *d-w-r “to turn”.
The – apparently iconic (descriptive) – reduplication *dār- dār- (or *dār- dawr-), attested in both Akkadian and early NWS (Ugaritic, Hebrew, Aramaic), may go back to PS.