as long as
Podemos seguir jugando, con tal de que no hagamos demasiado ruido.
We can keep playing, as long as we don’t make too much noise.
Te dejo que vayas, con tal de que no vuelvas tarde.
I'll let you go, as long as you don't come back late.
Con tal de que llegue hasta el valle.
As long as it reaches the valley.
— Nausicaä del valle del viento (1984)
No me importa, con tal de que seas feliz.
I don't mind, as long as you're happy.