1. United States Postal Service (USPS):
- First-Class Mail: 2-5 business days
- Priority Mail: 1-3 business days
- Priority Mail Express: 1-2 business days
2. Private Carriers (UPS, FedEx):
- Standard Ground Shipping: 2-5 business days
- Expedited Shipping (e.g., FedEx Express Saver, UPS Next Day Air): 1-3 business days
Please note that these are approximate delivery times and may vary due to factors such as weather conditions, postal workload, and the exact locations within Boston and Los Angeles. For more precise information, it's best to check with the specific shipping carrier or postal service.