It might sound like a silly question, I don't know....hoping someone can help me, as this is dinner tonight

Usually when i cook silverside I bring it to the boil then drain it & fill the pot with fresh water, onion, carrot, vinegar & a pinch of brown sugar. Works well.

But tonight I have put it on at 4:00 & it has only just come to the boil - at 5:30.
I don't have time to drain it & boil more water if that's how long it will take!

Does anyone know if it will be ok anyway?
I know it's probably a silly question but I don't want to muck with what works, you know?

TIA