Timeline: how to set duration of each frame, at the same time?

This can be done with a script. Initital state:

1. All frames must be located on the same track. If they are located on different tracks, then the frame duration will be set correctly, but the starting position of each frame will remain unchanged.
2. Before running the script, you need to select all the frames whose duration should be changed.

#target photoshop
s2t = stringIDToTypeID;
(r = new ActionReference()).putProperty(s2t('property'), p = s2t('targetLayersIDs'));
r.putEnumerated(s2t('document'), s2t('ordinal'), s2t('targetEnum'));
var selectedLayers = executeActionGet(r).getList(p),
    layers = [],
    frameRate;
(r = new ActionReference()).putProperty(s2t("property"), s2t("time"));
r.putClass(s2t("timeline"));
(d = new ActionDescriptor()).putReference(s2t("null"), r);
(d1 = new ActionDescriptor()).putInteger(s2t("seconds"), 0);
d1.putInteger(s2t("frame"), 0);
d.putObject(s2t("to"), s2t("timecode"), d1);
executeAction(s2t("set"), d, DialogModes.NO);
(r = new ActionReference()).putProperty(s2t('property'), p = s2t('frameRate'));
r.putClass(s2t('timeline'));
frameRate = executeActionGet(r).getDouble(p);
for (var i = 0; i < selectedLayers.count; i++) {
    (r = new ActionReference()).putIdentifier(s2t('layer'), selectedLayers.getReference(i).getIdentifier());
    (d = new ActionDescriptor()).putReference(s2t('null'), r);
    executeAction(s2t('select'), d, DialogModes.NO);
    (d1 = new ActionDescriptor()).putObject(s2t("resetTime"), s2t("timecode"), new ActionDescriptor());
    executeAction(s2t("moveOutTime"), d1, DialogModes.NO);
    (d = new ActionDescriptor()).putInteger(s2t("seconds"), 2);
    d.putInteger(s2t("frame"), -1);
    d.putDouble(s2t('frameRate'), frameRate);
    (d1 = new ActionDescriptor()).putObject(s2t("timeOffset"), s2t("timecode"), d);
    executeAction(s2t("moveOutTime"), d1, DialogModes.NO);
}