How to bulk delete Orders in Drupal Commerce module
If you've got 65,000 orders that you need to wipe, VBO isn't an option. You can try this:

TRUNCATE commerce_customer_profile;
TRUNCATE commerce_customer_profile_revision;
TRUNCATE commerce_funds_transactions;
TRUNCATE commerce_funds_user_funds;
TRUNCATE commerce_line_item;
TRUNCATE commerce_order;
TRUNCATE commerce_order_revision;
TRUNCATE commerce_payment_transaction;
TRUNCATE commerce_payment_transaction_revision;
TRUNCATE commerce_paypal_ipn;

TRUNCATE field_data_commerce_customer_address;
TRUNCATE field_data_commerce_customer_billing;
TRUNCATE field_data_commerce_customer_shipping;
TRUNCATE field_data_commerce_line_items;
TRUNCATE field_data_commerce_order_total;
TRUNCATE field_data_commerce_price;
TRUNCATE field_data_commerce_product;
TRUNCATE field_data_commerce_shipping_service;
TRUNCATE field_data_commerce_total;
TRUNCATE field_data_commerce_unit_price;

TRUNCATE field_data_commerce_coupon_order_reference;
TRUNCATE field_data_commerce_display_path;
TRUNCATE field_data_field_order_deliveryinstructions;
TRUNCATE field_data_field_order_flags;
TRUNCATE field_data_field_order_id;
TRUNCATE field_data_field_order_notes;
TRUNCATE field_data_field_supplier;


TRUNCATE field_revision_commerce_customer_address;
TRUNCATE field_revision_commerce_customer_billing;
TRUNCATE field_revision_commerce_customer_shipping;
TRUNCATE field_revision_commerce_line_items;
TRUNCATE field_revision_commerce_order_total;
TRUNCATE field_revision_commerce_price;
TRUNCATE field_revision_commerce_product;
TRUNCATE field_revision_commerce_shipping_service;
TRUNCATE field_revision_commerce_total;
TRUNCATE field_revision_commerce_unit_price;

TRUNCATE field_revision_commerce_coupon_order_reference;
TRUNCATE field_revision_commerce_display_path;
TRUNCATE field_revision_field_order_deliveryinstructions;
TRUNCATE field_revision_field_order_flags;
TRUNCATE field_revision_field_order_id;
TRUNCATE field_revision_field_order_notes;
TRUNCATE field_revision_field_supplier;