A practitioner collects the recent fixed-income market data and obtain the following estimation results for the Gauss+ model:

| Parameters | Estimation Results |

|------------|--------------------|

| α_r | 1.0547 |

| α_m | 0.6358 |

| α_l | 0.0165 |

| σ_m | 109.2 bps |

| σ_l | 96.4 bps |

| ρ | 0.212 |

| μ | 10.56% |

| r_t | 2.25% |

| m_t | 4.90% |

| l_t | 8.32% |

Based on the information provided, what is the half-life for long-term factor?