Shorten Building Time is the first half of a Ikariam Plus feature that will shorten the normal build time of any building level for a fee which is only payable using Ambrosia.

This feature has a 2 click process.
  1. The first click, Shorten Building Time, will reduce the normal build Time small for that building level by ½.
  2. The second click, Complete Instantly, will complete the building level.
    If more than ½ of the original build time has already been completed by the time you make your first click then the first click will complete the building level (Complete Instantly).
The exceptions to the buildings which can use this feature are the Palace and the Governor's Residences.

With patch 0.6.5 it became free to use when the building has less than 5 minutes remaining.

Ambrosia cost

For every 30 minutes of build time you will pay and additional 4 Ambrosia with a cap at 148 Ambrosia.

The formula that calculates the amount of Ambrosia needed based on the building time in seconds is as follows:
$ \mbox{Ambrosia cost} = \begin{cases}0 & \mbox{Building time in seconds} \le 300 ~ seconds \\ 4 \times \left ( \frac{\mbox{Building time in seconds}}{1,800 ~ seconds} \right ) + 4 & \mbox{Building time in seconds} \in (300 ~ through ~ 64,800) ~ seconds \\ 148 & \mbox{Building time in seconds} \ge 64,800 ~ seconds \end{cases} $
The formula above was used to produce the following table:
From (Min) To (Max) Ambrosia cost   From (Min) To (Max) Ambrosia cost
00s 05m 00s 0 9h 00m 00s 9h 29m59s 76
05m 01s 29m 59s 4 9h 30m 00s 9h 59m 59s 80
30m 00s 59m 59s 8 10h 00m 00s 10h 29m 59s 84
1h 00m 00s 1h 29m 59s 12 10h 30m 00s 10h 59m 59s 88
1h 30m 00s 1h 59m 59s 16 11h 00m 00s 11h 29m 59s 92
2h 00m 00s 2h 29m 59s 20 11h 30m 00s 11h 59m 59s 96
2h 30m 00s 2h 59m 59s 24 12h 00m 00s 12h 29m 59s 100
3h 00m 00s 3h 29m 59s 28 12h 30m 00s 12h 59m 59s 104
3h 30m 00s 3h 59m 59s 32 13h 00m 00s 13h 29m 59s 108
4h 00m 00s 4h 29m 59s 36 13h 30m 00s 13h 59m 59s 112
4h 30m 00s 4h 59m 59s 40 14h 00m 00s 14h 29m 59s 116
5h 00m 00s 5h 29m 59s 44 14h 30m 00s 14h 59m 59s 120
5h 30m 00s 5h 59m 59s 48 15h 00m 00s 15h 29m 59s 124
6h 00m 00s 6h 29m 59s 52 15h 30m 00s 15h 59m 59s 128
6h 30m 00s 6h 59m 59s 56 16h 00m 00s 16h 29m 59s 132
7h 00m 00s 7h 29m 59s 60 16h 30m 00s 16h 59m 59s 136
7h 30m 00s 7h 59m 59s 64 17h 00m 00s 17h 29m 59s 140
8h 00m 00s 8h 29m 59s 68 17h 30m 00s 17h 59m 59s 144
8h 30m 00s 8h 59m 59s 72 18h 00m 00s INFINITY 148
From (Min) To (Max) Ambrosia cost   From (Min) To (Max) Ambrosia cost
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