Think about how anyone learns something new: one idea at a time. The brain is not a bucket that fills; it is a ladder, and each rung must be climbed before the next. A lesson that tries to cover five ideas at once usually teaches none of them well.
Small lessons have a hidden advantage: they end in success. A short lesson has one clear idea, a few practice questions, and a visible win — "I can do this now." That feeling matters more than most parents realise. Success lowers anxiety, and lowered anxiety opens the door to the next idea. Big lessons often do the opposite: they pile on difficulty until the child feels lost, and a child who feels lost stops trying.
There is also tiredness. In a long session, the mistakes of the final stretch are not understanding failures — they are fatigue. But a child does not know that. To them, every tired mistake feels like proof they "just can't get it." Short lessons finish before fatigue starts, so the errors your child makes are honest ones we can actually fix.
This is how the best athletes and musicians train too: short, focused, regular. Nobody learns piano in one six-hour session, and nobody should learn maths that way. An idea met on five different days sticks; five ideas crammed into one evening mostly evaporate.
So our lessons are deliberately small: one idea, quick practice, a win, and stop. Your child finishes each one wanting to do the next — which is exactly the emotional state in which learning happens.