diff --git a/fading-rects/FadingRects.cpp b/fading-rects/FadingRects.cpp
index baf347e..c70255b 100644
--- a/fading-rects/FadingRects.cpp
+++ b/fading-rects/FadingRects.cpp
@@ -15,6 +15,7 @@
 #include <algorithm>
 
 const int default_frames_per_rect {10};
+const int fade_time {5}; // seconds
 
 enum class FadingState {
     fadein,
@@ -111,7 +112,7 @@ void FadingRects::update() {
         rect.cur_alpha = 0.0;
         rect.state = FadingState::fadein;
         rect.sustain_frame = 0;
-        rect.delta = rect.alpha / (5 * fps());
+        rect.delta = rect.alpha / (fade_time * fps());
         rect.line_width = random_between(1.0, 20.0);
         rect.x = rr.x;
         rect.y = rr.y;