2/4 is pretty damn fishy with a bunch of donks/tourists that don't care about the game. I would suggest at least finding a 3/6 game instead. I'm assuming you're talking about live poker. Whether you can build a BR depends on your goals, because in my experience a good day at the limit table is making half your BI, with a great day doubling your buy in. That's not a whole lot in the poker world, but it's enough for recreational player like me.