Hammer Jam Builder Potions: what the extra nine hours actually mean
A Builder Potion can speed up several builders at once. Here is a worked example and when saving the potion may make more sense.
Is a Builder Potion worth using during Hammer Jam? When several builders are busy and their upgrades have plenty of time left, that is usually a good opportunity. The useful first step is to separate time saved on each builder from time passing on the calendar.
What one potion adds
Supercell says a Builder Potion makes Home Village builders work at 10 times their normal speed for one hour. Without it, each builder would have completed one hour of work anyway. So a builder who stays busy for the whole boost gains nine additional hours of progress.
Take Supercell’s event example: an eligible upgrade normally lasting four days takes two days, or 48 hours, during Hammer Jam. If it has just started, after one hour without a potion it has 47 hours left; with a potion it has 38. The potion saved nine additional hours. It did not halve the discounted timer a second time.
With six builders busy for the full hour, that adds up to 54 builder-hours of extra work; with three, it is 27. Those are hours across separate upgrades, not 54 hours elapsed on the calendar. The gain is smaller if an upgrade finishes early and its builder sits idle.
Use it now or keep it?
Creator Clash Ninja recommends using Builder Potions during the event and considering books and hammers for other moments. The idea is that the discount has already shortened eligible timers, while a potion can accelerate several builders together; books and hammers each deal with one upgrade. Player fido464’s analysis of an earlier event likewise shows why the number of active builders matters to the comparison.
That does not mean everyone must hoard potions. Finishing one critical building immediately may suit your plan better if you lack resources for another upgrade or need a hero available soon. Before using a potion, start upgrades with enough time remaining and consider whether you can keep builders supplied afterwards.
The current international Hammer Jam ends November 16 at 08:00 UTC: 15:00 in western Indonesia and Thailand, or 16:00 in the Philippines. It is open from Town Hall 3. Only eligible Home Village upgrades receive the discount; Supercharges and Crafted Defenses are excluded from the time and cost reductions.
