dtr's are made to take a thrashing they can cope with alot of abuse i think its sad to see bikes on e bay ect that say never thrashed or never used off road its an enduro ffs
just thrash it till it dies dont worry about how many miles it will take cos every single engine is different when its on its way out it will let you know m8
It depends on so many variables really. Is the engine warmed up fully before thrashing Quality of oil Service intervals on time Quality piston kits or the 20 quid cheapo's Nuts and bolts all torqued to spec Carb settings