Within a few weeks, you're likely to notice some small growth, possibly
way down at the base of the plant, possibly along the twigs if they're still
alive. Even if the twigs are dry and break easily and don't have much of an
apparently viable cambium when scraped, it's possible that the plants may
come back from some viable cells, often down low.
Only you can decide if your time is worth it to keep watering. If you
want to make the job easier, group the pots on a base of several inches
of sand or potting soil-- it'll decrease watering time and frequency in