---
title: DynamicCircuitInstructionDurations (latest version)
description: API reference for qiskit_ibm_runtime.transpiler.passes.scheduling.DynamicCircuitInstructionDurations in the latest version of qiskit-ibm-runtime
source: https://quantum.cloud.ibm.com/docs/en/api/qiskit-ibm-runtime/transpiler-passes-scheduling-dynamic-circuit-instruction-durations
---

# DynamicCircuitInstructionDurations

*class* `DynamicCircuitInstructionDurations(instruction_durations=None, dt=None, enable_patching=True)`

[GitHub](https://github.com/Qiskit/qiskit-ibm-runtime/tree/stable/0.49/qiskit_ibm_runtime/transpiler/passes/scheduling/utils.py#L140-L346)

Bases: [`InstructionDurations`](/docs/api/qiskit/qiskit.transpiler.InstructionDurations)

Dynamic circuit instructions durations.

For dynamic circuits the IBM Qiskit backend currently reports instruction durations that differ compared with those required for the legacy Qobj-based path. For now we use this class to report updated InstructionDurations.

TODO: This would be mitigated by a specialized Backend/Target for dynamic circuit backends.

## Attributes

**Parameters**

- **instruction\_durations** (*InstructionDurationsType | None*)
- **dt** (*float | None*)
- **enable\_patching** (*bool*)

### MEASURE\_PATCH\_CYCLES

Default value: `160`

### MEASURE\_PATCH\_ODD\_OFFSET

Default value: `64`

## Methods

### from\_backend

*classmethod* `from_backend(backend)`

[GitHub](https://github.com/Qiskit/qiskit-ibm-runtime/tree/stable/0.49/qiskit_ibm_runtime/transpiler/passes/scheduling/utils.py#L173-L184)

Construct a `DynamicInstructionDurations` object from the backend.

**Parameters**

**backend** (*Backend*) – backend from which durations (gate lengths) and dt are extracted.

**Returns**

The InstructionDurations constructed from backend.

**Return type**

[DynamicCircuitInstructionDurations](#qiskit_ibm_runtime.transpiler.passes.scheduling.DynamicCircuitInstructionDurations "qiskit_ibm_runtime.transpiler.passes.scheduling.DynamicCircuitInstructionDurations")

### from\_target

*classmethod* `from_target(target)`

[GitHub](https://github.com/Qiskit/qiskit-ibm-runtime/tree/stable/0.49/qiskit_ibm_runtime/transpiler/passes/scheduling/utils.py#L186-L204)

Construct a `DynamicInstructionDurations` object from the target.

**Parameters**

**target** (*Target*) – target from which durations (gate lengths) and dt are extracted.

**Returns**

The InstructionDurations constructed from backend.

**Return type**

[DynamicCircuitInstructionDurations](#qiskit_ibm_runtime.transpiler.passes.scheduling.DynamicCircuitInstructionDurations "qiskit_ibm_runtime.transpiler.passes.scheduling.DynamicCircuitInstructionDurations")

### get

`get(inst, qubits, unit='dt', parameters=None)`

Get the duration of the instruction with the name, qubits, and parameters.

Some instructions may have a parameter dependent duration.

**Parameters**

- **inst** (*str |* [*Instruction*](/docs/api/qiskit/qiskit.circuit.Instruction)) – An instruction or its name to be queried.
- **qubits** (*int | list\[int]*) – Qubit indices that the instruction acts on.
- **unit** (*str*) – The unit of duration to be returned. It must be ‘s’ or ‘dt’.
- **parameters** (*list\[float] | None*) – The value of the parameters of the desired instruction.

**Returns**

The duration of the instruction on the qubits.

**Return type**

float|int

**Raises**

**TranspilerError** – No duration is defined for the instruction.

### units\_used

`units_used()`

Get the set of all units used in this instruction durations.

**Returns**

Set of units used in this instruction durations.

**Return type**

set\[str]

### update

`update(inst_durations, dt=None)`

[GitHub](https://github.com/Qiskit/qiskit-ibm-runtime/tree/stable/0.49/qiskit_ibm_runtime/transpiler/passes/scheduling/utils.py#L206-L252)

Update self with inst\_durations (inst\_durations overwrite self).

Overrides the default durations for certain hardcoded instructions.

**Parameters**

- **inst\_durations** (*InstructionDurationsType | None*) – Instruction durations to be merged into self (overwriting self).
- **dt** (*float | None*) – Sampling duration in seconds of the target backend.

**Returns**

The updated InstructionDurations.

**Raises**

**TranspilerError** – If the format of instruction\_durations is invalid.

**Return type**

[DynamicCircuitInstructionDurations](#qiskit_ibm_runtime.transpiler.passes.scheduling.DynamicCircuitInstructionDurations "qiskit_ibm_runtime.transpiler.passes.scheduling.DynamicCircuitInstructionDurations")