bump path build handover window, check cooldown on build.

llarp/service/endpoint.cpp

@@ -1208,8 +1208,9 @@ namespace llarp
       const auto dlt = intro.expiresAt - now;
       return should
           || (  // try spacing tunnel builds out evenly in time
-                 (dlt <= (path::default_lifetime / 4))
-                 && (NumInStatus(path::ePathBuilding) < numPaths));
+                 (dlt < (path::default_lifetime / 4))
+                 && (NumInStatus(path::ePathBuilding) < numPaths)
+                 && !path::Builder::BuildCooldownHit(now));
     }
 
     std::shared_ptr< Logic >

llarp/service/intro.hpp

@@ -30,7 +30,7 @@ namespace llarp
       }
 
       bool
-      ExpiresSoon(llarp_time_t now, llarp_time_t dlt = 15000) const
+      ExpiresSoon(llarp_time_t now, llarp_time_t dlt = 30000) const
       {
         if(dlt)
           return now >= (expiresAt - dlt);