  We demonstrate that time-domain ptychography, a recently introduced ultrafast
pulse reconstruction modality, has properties ideally suited for the temporal
characterization of complex light pulses with large time-bandwidth products as
it achieves temporal resolution on the scale of a single optical cycle using
long probe pulses, low sampling rates, and an extremely fast and robust
algorithm. In comparison to existing techniques, ptychography minimizes the
data to be recorded and processed, and drastically reduces the computational
time of the reconstruction. Experimentally we measure the temporal waveform of
an octave-spanning, 3.5~ps long supercontinuum pulse generated in photonic
crystal fiber, resolving features as short as 5.7~fs with sub-fs resolution and
30~dB dynamic range using 100~fs probe pulses and similarly large delay steps.
