Because you will be the only modeller that I know who doesn't sail a model for about 5-10 minutes and then stop - standing talking for next 30-35 mins whilst the model drifts off merrily away and out of sight. The only time I have known anyone to spend longer than 5 mins actually sailing a model is during a competition.
John aye john
I must be the (or one of those) exception(s), who use their models for actually running them 90% of the time.
The main cause for that is the lack of a lake to run my boats on; I live in Sneek, with miles and miles of canals, a lot of them with footpaths alongside, so I can take my boats for a stroll circumventing our town, which takes about an hour, depending on how long the remaining 10% of standing around, and talking to spectators takes...
When I fancy a long walk, I carry my boat from one shippable section to the next, which will take me about three hours of running the boat.
By that time I'm more worn out than my boat, which can run up to four hours continuously full throttle on a 8000mAh Lipo.