I think that my 22 feet of 16mm2 T&E to the cooker point might be a tad oversized, but it *was* free :)
Our double over is rated at 4.9kW peak load (it does also quote an average of 0.79kWh per oven for its consumption, suggesting a duty cycle of just over 32% on).
Our induction hob is rated at 7.3kW, but can take a peak of 9.7kW, for a maximum of 10 minutes, if all four "rings" are heating and the two largest are in "powerboost" mode (it automatically limits to two at a time and and cuts back to normal full-power after 10 minutes).
So the hob is twice the peak load of the ovens - although I don't know the duty cycle for the hob "rings" and so can't compare the average loads).