diff --git a/iguana/dPoW.h b/iguana/dPoW.h
index 7ceb304b1..da8db86e2 100755
--- a/iguana/dPoW.h
+++ b/iguana/dPoW.h
@@ -51,6 +51,8 @@
 #define PUB_SOCK 7773
 #define REP_SOCK 7772
 
+#define DPOW_EPOCHDURATION 600
+
 struct dpow_coinentry
 {
     bits256 prev_hash;
diff --git a/iguana/dpow/dpow_network.c b/iguana/dpow/dpow_network.c
index dd19d55b5..ca093a82f 100755
--- a/iguana/dpow/dpow_network.c
+++ b/iguana/dpow/dpow_network.c
@@ -902,12 +902,12 @@ void dpow_ratify_update(struct supernet_info *myinfo,struct dpow_info *dp,struct
         if ( besti >= 0 && bestks[besti] >= 0 && masks[besti] != 0 && (bp->ratifyrecvmask & masks[besti]) == masks[besti] )
             bp->ratifybestmask = masks[besti], bp->ratifybestk = bestks[besti];
         //printf("numdiff.%d besti.%d numbest.%d (%d %llx) vs (%d %llx)\n",numdiff,besti,best,besti>=0?bestks[besti]:-1,(long long)(besti>=0?masks[besti]:0),bestk,(long long)bestmask);
-        if ( bp->ratifybestmask == 0 || (time(NULL) / 100) != bp->lastepoch )
+        if ( bp->ratifybestmask == 0 || (time(NULL) / DPOW_EPOCHDURATION) != bp->lastepoch )
         {
             bp->ratifybestmask = dpow_ratifybest(bp->ratifyrecvmask,bp,&bp->ratifybestk);
-            if ( (time(NULL) / 100) != bp->lastepoch )
+            if ( (time(NULL) / DPOW_EPOCHDURATION) != bp->lastepoch )
             {
-                bp->lastepoch = (uint32_t)(time(NULL) / 100);
+                bp->lastepoch = (uint32_t)(time(NULL) / DPOW_EPOCHDURATION);
                 printf("epoch %u\n",bp->lastepoch % bp->numnotaries);
                 sleep(2 + (rand() % 7));
             }
diff --git a/iguana/dpow/dpow_tx.c b/iguana/dpow/dpow_tx.c
index e564aa895..abdce53ce 100755
--- a/iguana/dpow/dpow_tx.c
+++ b/iguana/dpow/dpow_tx.c
@@ -82,7 +82,7 @@ uint64_t dpow_ratifybest(uint64_t refmask,struct dpow_block *bp,int8_t *lastkp)
     *lastkp = -1;
     for (m=j=0; j<bp->numnotaries; j++)
     {
-        k = (j + ((uint32_t)time(NULL) / 100)) % bp->numnotaries;//DPOW_MODIND(bp,j);
+        k = (j + ((uint32_t)time(NULL) / DPOW_EPOCHDURATION)) % bp->numnotaries;//DPOW_MODIND(bp,j);
         if ( bp->require0 != 0 && k == 0 )
             continue;
         if ( bits256_nonz(bp->notaries[k].ratifysrcutxo) != 0 && bits256_nonz(bp->notaries[k].ratifydestutxo) != 0 )