I'll add another +1 for cleric. It starts strong and continues throughout all levels.
As for the time it takes, you will find this is a long game, it's longer than some pc games. I've recently started a speed run and have already taken 12 hours or so, despite knowing what to do, where to go and not doing any extra missions. It's a game you can lose a lot of time to
I think the easiest build to play for a non-experienced player is a 2H warrior, going all STR+END, Whirlwind and Two Handed expert. Clerics may be the best for an expert player, but many players hit a wall due to low DPS at mid level, while everybody knows how to play a 2H warrior and it keeps improving nicely.
+1 for warriors basically it the easiest to use whether 2 handed or 1 hand they have high hp and high dps but i personally prefer mages idk whu but i find mages the easiest to play with if you know how to use them tho