The amount of liquid generated fluctuates dependent upon the water content in the waste being recycled. Vegetables and grass are high in water content, whilst other waste may contain significantly less.
It is worth remembering that a caddy of food waste (5L) could produce up to 2L of liquid so regular checking, removal and use is essential to avoid overflow.
So, whatever you recycle, check weekly and remove and use the liquid fertiliser. You can store this liquid fertilizer and use it later. Do note that the strength of it will weaken over a long period of time.