Branch length

OK, so I tied down my plant. Now the branches are taller than the plant was. How long will the branches grow??? I started tying down the branches. And now I need to tie down the branches that shot up from the branches. But I am out of room. I can't even get around my plants. SO... does anyone know how long the branches can get. I have pure sativa and a sativa/indica mix.

they will keep growing upwards until finished. Tying down saves space height wise but not so well in confined areas.