NBA season is actually less taxing on players bodies compared to EL + NT schedule that guys like Teodosic have endured. You actually have an offseason when you can regenerate, heal, and get in shape. European guys like Teodosic on average get a week or so off, inbetween their seasons. That is just insane.
The overall number of games might be around the same (30 EL regular season + playoffs + Domestic/Regional leagues 30 - 50 games depending on the country, domestic cups etc). Still the intensity of practices and number of them is much bigger than in the NBA.
So yes, in season might be a little bit easier on Euro guys to play in Europe since there is more room between each individual games, but overall wear on the bodies with each passing year increases exponentially since they never rest. Once you get used to the tempo in NBA, that offseason does wonders for you. Just look at Pau, Scola, Nowitzki all those guys and how they stayed healthy in their late 30s. There would be no chance they could've made it that far in European leagues...