> why not go all the way and use Uint64 instead? It should give us another million years.

int64 requires less changes, musmon.c contains

  if (--(csound->cyclesRemaining) <= 0) ...
  ...
  while (csound->cyclesRemaining <= 0)...
  ...

Here is the simplest patch, you can improve or ignore it

diff -ur csound5~/Engine/musmon.c csound5/Engine/musmon.c
--- csound5~/Engine/musmon.c	2012-02-24 22:58:37.000000000 +0100
+++ csound5/Engine/musmon.c	2012-02-24 23:09:48.000000000 +0100
@@ -805,7 +805,7 @@
     return retval;
 }
 
-#define RNDINT(x) ((int) ((double) (x) + ((double) (x) < 0.0 ? -0.5 : 0.5)))
+#define RNDINT64(x) ((int64_t) ((double) (x) + ((double) (x) < 0.0 ? -0.5 : 0.5)))
 
 extern  int     sensMidi(CSOUND *);
 
@@ -919,10 +919,10 @@
       /* calculate the number of k-periods remaining until next event */
       if (O->Beatmode)
         csound->cyclesRemaining =
-          RNDINT((csound->nxtbt - csound->curBeat) / csound->curBeat_inc);
+          RNDINT64((csound->nxtbt - csound->curBeat) / csound->curBeat_inc);
       else {
         csound->cyclesRemaining =
-          RNDINT((csound->nxtim*csound->esr - csound->icurTime) / csound->ksmps);
+          RNDINT64((csound->nxtim*csound->esr - csound->icurTime) / csound->ksmps);
         csound->nxtim = (csound->cyclesRemaining*csound->ksmps+csound->icurTime)/csound->esr;
       }
     }
diff -ur csound5~/H/csoundCore.h csound5/H/csoundCore.h
--- csound5~/H/csoundCore.h	2012-02-24 22:58:37.000000000 +0100
+++ csound5/H/csoundCore.h	2012-02-24 23:17:35.000000000 +0100
@@ -1062,7 +1062,7 @@
     /** start time of current section    */
     double        timeOffs, beatOffs;
     /** current time in seconds, inc. per kprd */
-    long          icurTime;   /* Current time in samples */
+    int64_t       icurTime;   /* Current time in samples */
     double        curTime_inc;
     /** current time in beats, inc per kprd */
     double        curBeat, curBeat_inc;
@@ -1209,7 +1209,7 @@
     void          **cfgVariableDB;
     double        prvbt, curbt, nxtbt;
     double        curp2, nxtim;
-    int           cyclesRemaining;
+    int64_t       cyclesRemaining;
     EVTBLK        evt;
     void          *memalloc_db;
     MGLOBAL       *midiGlobals;

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