heck/kubejs/client_scripts/time_in_a_bottle.js

// priority: 0

onEvent("item.tooltip", event => {
  const ItemDescription = java("com.simibubi.create.foundation.item.ItemDescription");
  const Palette         = java("com.simibubi.create.foundation.item.ItemDescription$Palette");

  event.addAdvanced("tiab:time_in_a_bottle", (item, _, tooltip) => {
    let name = tooltip[0];
    tooltip.pop(); // Remove "Stored time hh:mm:ss" line.

    let storedTime = item.nbt.getInt("storedTime");
    let totalSeconds = Math.floor(storedTime / 20);
    let totalMinutes = Math.floor(totalSeconds / 60)
    let totalHours   = Math.floor(totalMinutes / 60);

    if (totalSeconds > 0) {
      name.append(" (");
      if (totalHours   > 0) name.append(`${totalHours}h`);
      if (totalMinutes > 0) name.append(`${totalMinutes % 60}m`);
      name.append(`${totalSeconds % 60}s)`);
    }

    new ItemDescription(Palette.Gray)
      .withSummary(Component.translate("item.tiab.time_in_a_bottle.tooltip.summary"))
      // Create expects localized strings instead of components here, so we localize ourselves
      .withControl(Component.translate("item.tiab.time_in_a_bottle.tooltip.condition").string,
        Component.translate("item.tiab.time_in_a_bottle.tooltip.behaviour").string)
      .createTabs()
      .addInformation(tooltip);
  });
});