How fast can you fix a critical WooCommerce error?

Emergency tickets (store down, checkout dead) get a senior developer during my working hours (10 AM to 7 PM IST, Monday to Saturday), often inside the hour. A typical well-defined bug is reproduced, root-caused and shipped in 24-48 hours. Speed depends on access: with staging or live admin + SFTP ready, we move immediately; if we have to arrange access first, add that time. The single biggest accelerator is pasting the exact error string from wp-content/debug.log in your report.