Attosecond electron dynamics driven by strong laser fields are a cornerstone of strong-field physics. However, quantum many-body correlations have prevented the resolution of ionization and rescattering dynamics from specific valence subshells. Here, we present a theoretical framework that integrates time-dependent density functional theory with Bohmian mechanics, enabling us to track the attosecond dynamics of electrons from individual quantum orbitals in real time. Applying this to the many-electron argon atom uncovers a pronounced orientation-dependent effect. For $p$-orbital electrons, ionization occurs earlier for the perpendicular ($m=\pm 1$) alignment than for the parallel ($m$ = 0), yet the subsequent rescattering is delayed. This orientation-dependent dynamics persists even when the total ionization yield is lower. Our work provides an attosecond-resolved, orbital-specific picture of strong-field processes and establishes a foundation for future explorations of orbital-selective control with tailored waveforms.

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• Atomic & molecular processes in external fields