diff --git a/harmony/harmonytask/harmonytask.go b/harmony/harmonytask/harmonytask.go
index e054d3cf1..e59b79ca3 100644
--- a/harmony/harmonytask/harmonytask.go
+++ b/harmony/harmonytask/harmonytask.go
@@ -26,7 +26,7 @@ type TaskTypeDetails struct {
 	// Max returns how many tasks this machine can run of this type.
 	// Nil (default)/Zero or less means unrestricted.
 	// Counters can either be independent when created with Max, or shared between tasks with SharedMax.Make()
-	Max Limiter
+	Max taskhelp.Limiter
 
 	// Name is the task name to be added to the task list.
 	Name string
@@ -105,23 +105,6 @@ type TaskInterface interface {
 	Adder(AddTaskFunc)
 }
 
-type Limiter interface {
-	// Active returns the number of tasks of this type that are currently running
-	// in this limiter / limiter group.
-	Active() int
-
-	// ActiveThis returns the number of tasks of this type that are currently running
-	// in this limiter (e.g. per-task-type count).
-	ActiveThis() int
-
-	// AtMax returns whether this limiter permits more tasks to run.
-	AtMax() bool
-
-	// Add increments / decrements the active task counters by delta. This call
-	// is atomic
-	Add(delta int)
-}
-
 // AddTaskFunc is responsible for adding a task's details "extra info" to the DB.
 // It should return true if the task should be added, false if it was already there.
 // This is typically accomplished with a "unique" index on your detals table that
@@ -188,6 +171,7 @@ func New(
 		if h.Max == nil {
 			h.Max = taskhelp.Max(0)
 		}
+		h.Max = h.Max.Instance()
 
 		if Registry[h.TaskTypeDetails.Name] == nil {
 			return nil, fmt.Errorf("task %s not registered: var _ = harmonytask.Reg(t TaskInterface)", h.TaskTypeDetails.Name)
diff --git a/harmony/taskhelp/max.go b/harmony/taskhelp/max.go
index 05e89c404..46ed7b512 100644
--- a/harmony/taskhelp/max.go
+++ b/harmony/taskhelp/max.go
@@ -4,6 +4,27 @@ import (
 	"sync/atomic"
 )
 
+type Limiter interface {
+	// Active returns the number of tasks of this type that are currently running
+	// in this limiter / limiter group.
+	Active() int
+
+	// ActiveThis returns the number of tasks of this type that are currently running
+	// in this limiter (e.g. per-task-type count).
+	ActiveThis() int
+
+	// AtMax returns whether this limiter permits more tasks to run.
+	AtMax() bool
+
+	// Add increments / decrements the active task counters by delta. This call
+	// is atomic
+	Add(delta int)
+
+	// Instance spawns a sub-instance of this limiter. This is called by harmonytask on startup for each task
+	// using this limiter. Each sub-instance has it's own individual "This" counter, but can share a common counter.
+	Instance() Limiter
+}
+
 type MaxCounter struct {
 	// maximum number of tasks of this type that can be run
 	N int
@@ -37,6 +58,10 @@ func (m *MaxCounter) Add(n int) {
 	m.currentThis.Add(int32(n))
 }
 
+func (m *MaxCounter) Instance() Limiter {
+	return &MaxCounter{N: m.N, current: m.current, currentThis: new(atomic.Int32)}
+}
+
 func Max(n int) *MaxCounter {
 	return &MaxCounter{N: n, current: new(atomic.Int32), currentThis: new(atomic.Int32)}
 }
diff --git a/tasks/seal/task_sdr.go b/tasks/seal/task_sdr.go
index 2e989821b..1622e2550 100644
--- a/tasks/seal/task_sdr.go
+++ b/tasks/seal/task_sdr.go
@@ -14,6 +14,7 @@ import (
 	"github.com/filecoin-project/curio/harmony/harmonydb"
 	"github.com/filecoin-project/curio/harmony/harmonytask"
 	"github.com/filecoin-project/curio/harmony/resources"
+	"github.com/filecoin-project/curio/harmony/taskhelp"
 	"github.com/filecoin-project/curio/lib/dealdata"
 	ffi2 "github.com/filecoin-project/curio/lib/ffi"
 	"github.com/filecoin-project/curio/lib/paths"
@@ -45,11 +46,11 @@ type SDRTask struct {
 
 	sc *ffi2.SealCalls
 
-	max harmonytask.Limiter
+	max taskhelp.Limiter
 	min int
 }
 
-func NewSDRTask(api SDRAPI, db *harmonydb.DB, sp *SealPoller, sc *ffi2.SealCalls, maxSDR harmonytask.Limiter, minSDR int) *SDRTask {
+func NewSDRTask(api SDRAPI, db *harmonydb.DB, sp *SealPoller, sc *ffi2.SealCalls, maxSDR taskhelp.Limiter, minSDR int) *SDRTask {
 	return &SDRTask{
 		api: api,
 		db:  db,
diff --git a/tasks/unseal/task_unseal_sdr.go b/tasks/unseal/task_unseal_sdr.go
index d8cf3880f..57d09027b 100644
--- a/tasks/unseal/task_unseal_sdr.go
+++ b/tasks/unseal/task_unseal_sdr.go
@@ -13,6 +13,7 @@ import (
 	"github.com/filecoin-project/curio/harmony/harmonydb"
 	"github.com/filecoin-project/curio/harmony/harmonytask"
 	"github.com/filecoin-project/curio/harmony/resources"
+	"github.com/filecoin-project/curio/harmony/taskhelp"
 	"github.com/filecoin-project/curio/lib/ffi"
 	"github.com/filecoin-project/curio/lib/passcall"
 	"github.com/filecoin-project/curio/lib/paths"
@@ -30,14 +31,14 @@ type UnsealSDRApi interface {
 }
 
 type TaskUnsealSdr struct {
-	max harmonytask.Limiter
+	max taskhelp.Limiter
 
 	sc  *ffi.SealCalls
 	db  *harmonydb.DB
 	api UnsealSDRApi
 }
 
-func NewTaskUnsealSDR(sc *ffi.SealCalls, db *harmonydb.DB, max harmonytask.Limiter, api UnsealSDRApi) *TaskUnsealSdr {
+func NewTaskUnsealSDR(sc *ffi.SealCalls, db *harmonydb.DB, max taskhelp.Limiter, api UnsealSDRApi) *TaskUnsealSdr {
 	return &TaskUnsealSdr{
 		max: max,
 		sc:  sc,