Two days. Same spot, same gear, very similar wind meters, vastly different wind.
Day one: In session A the wind was very consistent. Easy to fly the kite, and easy to ride hard on 15m Sonic Race and pocket race foil. Really fun!
Day two: In session B the wind was very inconsistent, gusts and lulls meant lots of active flying to keep same kite in the air. Kite would back stall during lulls, fold a wingtip, classic zero wind behaviors, then surge and overfly in gusts, requiring lots of attention. Swiss cheese wind. Not consistent enough to even get up on foil, but able to keep kite in the air with active flying.
In letter C, the meters read slightly higher wind averages, but wind still full of holes, similar to B. No joy!
We need more to describe light wind than 6, 7, or 8 knots. We need another value to measure consistency. Some 7 knot days are solid, and some you can feel the wind pulsing on and off and not long enough to get going.