In May, the House Energy and Commerce Committee voted 48-1 in favor of the Sunshine Protection Act. The U.S. Senate voted unanimously in March 2022 to make daylight saving time permanent but the House never took up the measure in the face of opposition. The proposal the House will consider next week would allow states to opt out.
Thirty minute time zones are not at all feasible.
The best solution is to permanently adopt the more widely used system (DST) immediately, then reconsider the boundaries of four (or perhaps five) zones.