60 * 60 > Time.toMinutes (#4634)

It already exists in other places in the code, doesn't make sense to not use it.

core/src/mindustry/game/Rules.java

@@ -63,7 +63,7 @@ public class Rules{
     /** Radius around enemy wave drop zones.*/
     public float dropZoneRadius = 300f;
     /** Time between waves in ticks. */
-    public float waveSpacing = 60 * 60 * 2;
+    public float waveSpacing = 2 * Time.toMinutes;
     /** Wave after which the player 'wins'. Used in sectors. Use a value <= 0 to disable. */
     public int winWave = 0;
     /** Base unit cap. Can still be increased by blocks. */