Oven power supply questions

Current old oven is on the fritz, have tried unsuccessfully to get a sparky out for a power assessment so hoping to get some guidance here before next week. Electric oven, grill and cooktop

1 - is there a way to extend an oven power feed by a couple of meters or does it require a full new run back to the meter board?

2 - is there any way to know how many amps the current feed is? The circuit is unmarked and can't see any markings on the heavy gauge orange sheathed cable. Total max draw of current oven is 9200w according to the circuit diagram on the back. 1990s model oven from what I can tell but the feed may predate that back to mid 70s build date .

To be clear to the AI moderator, I'm not asking advice on how to conduct unlicenced electrical work