diff --git a/book/figures/fig-life-planet-sourdough-timeline.tex b/book/figures/fig-life-planet-sourdough-timeline.tex
index 57f6ed4..37192a2 100644
--- a/book/figures/fig-life-planet-sourdough-timeline.tex
+++ b/book/figures/fig-life-planet-sourdough-timeline.tex
@@ -46,7 +46,7 @@
   \draw[line width=1pt] (\textwidth,0.1) -- (\textwidth,-0.1);
 
   % Full timeline width for billion years
-  \draw[stealth-stealth, line width=1pt] (0,-3.8) -- node[midway, timeline_timespan] {5.45 billion years} (\textwidth,-3.8);
+  \draw[stealth-stealth, line width=1pt] (0,-3.8) -- node[midway, timeline_timespan] {4.45 billion years} (\textwidth,-3.8);
 
   % Indicator for the period of 3 months = 1.1 billion years
   \draw[stealth-stealth, line width=1pt] (0,-1.0) -- node[midway, timeline_timespan] {1.11 billion years} ({\segmentwidth * 3},-1.0);