That's just it. There is no grind in Lost Ark. To try to push you to spend money, the things you can do to earn gold/mats are severely limited. So, you log in, do your weekly dungeon, ok that's done for the week. Weekly Epona quests, maybe 30 minutes or so a day, for 3 days, that's done. 3 daily eponas, that's 15ish minutes. Spend your workpoints gathering, that's 15-30 minutes a day, depending on what you gather. Now, you can either do some of the boring, tedious side shit they make you do to work on getting your skill point pots (not technically a grind, since each only has to be earned once, and "extra" skill points are account/server wide), or you can queue for arena. That's it.
Usually, the grind in an MMO is for gold, gear, or xp. None of that here. Unless you want to do like I do in RU and run extra accounts. That's a bit of a grind, but not too bad. Leveling to 50 is the worst part. Once (or twice) for each account. Then you just log in, dailes/weeklies (for epona gold bag) and gather. Takes 30-45 minutes per account. With 2 level 50s you can earn enough epona badges for the bag in 2 days, then for the rest of the week you can just log in and gather. I make about 24k gold a week, when I actually feel like doing it.