To save more upgrade time with a Book of Building, use it on a longer eligible construction project rather than a short one. This increases the time skipped; it does not establish that the item’s overall value doubles.
Compare upgrade timers before using a Book
The draft compares a four-day upgrade with one lasting 14 to 20 days. On the time-saved measure, completing the longer upgrade skips more time. Check the remaining timers on your eligible construction projects before spending the Book.
The draft names the Laboratory, Clan Castle, and Eagle Artillery as possible targets, but it does not establish which is eligible or best for your account. Compare their available upgrade timers, and use the Book on the longest option that suits your plans.
Don’t treat “double value” as guaranteed
A longer timer can mean more time skipped, but that alone does not prove a Book’s total value doubles. The source title promotes doubling Book value, but the supplied material does not explain or verify a method that guarantees it.
Choose based on the time you want to skip, and avoid spending the Book on a short upgrade if a longer eligible construction project is available.
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Player Comments
37 players commented on this guide.
I tried this today and it worked better than my old setup.
This helped me understand base building much better.
I wish I had read this before upgrading the wrong thing.
Good guide for Clash of Clans players. The base building part was useful.