Duen matio

sanostol
You can middele click on the node in the networkview

or if You need it automated:

import _alembic_hom_extensions as abc
time_range = abc.alembicTimeRange(archive_path)
start_frame = timerange[0]*hou.fps()
end_frame = timerange[1]*hou.fps()

the values are the actual samples, so if You have motion samples they have a additional step

sanostol
You can middele click on the node in the networkview

or if You need it automated:

Thanks 
import _alembic_hom_extensions as abc
time_range = abc.alembicTimeRange(archive_path)
start_frame = timerange[0]*hou.fps()
end_frame = timerange[1]*hou.fps()

the values are the actual samples, so if You have motion samples they have a additional step