I think it is something like you, a little more. If I add the lucid time of all the LDs, they will be like 10 minutes, so the average is 2 minutes. 1:20 sec 2: 10 sec 3: 20 sec 4: 2 min 5: 7 min
Since I got up to 5 purposefully induced lucid dreams (same as you) I gotta ask, what is your average time span of the time you are lucid? I can basically make it about 1 minute most, on average about 20 seconds.