  First identified in 2016 by JAXA's Akatsuki mission, the
discontinuity/disruption is a recurrent wave observed to propagate during
decades at the deeper clouds of Venus (47--56 km above the surface), while its
absence at the clouds' top ($\sim$70 km) suggests that it dissipates at the
upper clouds and contributes in the maintenance of the puzzling atmospheric
superrotation of Venus through wave-mean flow interaction. Taking advantage of
the campaign of ground-based observations undertaken in coordination with the
Akatsuki mission since December 2021 until July 2022, we aimed to undertake the
longest uninterrupted monitoring of the cloud discontinuity up to date to
obtain a pioneering long-term characterization of its main properties and
better constrain its recurrence and lifetime.
  The dayside upper, middle and nightside lower clouds were studied with images
with suitable filters acquired by Akatsuki/UVI, amateur observers and NASA's
IRTF/SpeX, respectively. Hundreds of images were inspected in search of
manifestations of the discontinuity events and to measure key properties like
its dimensions, orientation or rotation period. We succeeded in tracking the
discontinuity at the middle clouds during 109 days without interruption. The
discontinuity exhibited properties nearly identical to measurements in 2016 and
2020, with an orientation of $91^{\circ}\pm 8^{\circ}$, length/width of
$4100\pm 800$ / $500\pm 100$ km and a rotation period of $5.11\pm 0.09$ days.
Ultraviolet images during 13-14 June 2022 suggest that the discontinuity may
have manifested at the top of the clouds during $\sim$21 hours as a result of
an altitude change in the critical level for this wave due to slower zonal
winds.
