diff --git a/bilby/gw/likelihood.py b/bilby/gw/likelihood.py
index 7c32e80e024e195338af8668601c66b1785c2243..2f3d7ab76e068bd9660840eec13f708af0326bbd 100644
--- a/bilby/gw/likelihood.py
+++ b/bilby/gw/likelihood.py
@@ -925,7 +925,8 @@ class ROQGravitationalWaveTransient(GravitationalWaveTransient):
 
         """
 
-        earth_light_crossing_time = 2 * radius_of_earth / speed_of_light
+        # Maximum delay time to geocentre plus 10%
+        earth_light_crossing_time = 1.1 * radius_of_earth / speed_of_light
         time_space = self._get_time_resolution()
         delta_times = np.arange(
             self.priors['geocent_time'].minimum - earth_light_crossing_time,