The news story says it's two to five years - two years would get you half what a spouse would get or five years exactly what a spouse would get. Or if you had children.
I am uncomfortable about it on behalf of people who don't realise by living together they are giving their partner these rights - if loads of people don't realise they don't have the same rights now, equally loads of people won't realise they are granting the new rights once they are in place.
Maybe they should start with a publicity campaign so people who live together as a stable couple realise they need to make wills? And registrars should offer information about this when unmarried couples register births?
The whole point of marriage is that it is legal, state recognition of your relationship. If you choose not to get married and don't make a will, it suggests you have chosen to opt out of that legal commitment.
Btw, if you are unmarried and own your house together, I think inheritance depends upon whether you are tenants in common or joint tenants (not sure of the wording). Something your solicitor should explain to you when you buy. But that is also an issue for married couples, I gather.
And I have no idea which we are, tbh, despite being married. Although I do remember the solicitor taking us through this when we were unmarried and bought our first flat, largely because dh stuck in a few grand he had inherited as the deposit and his Dad was keen to protect that inheritance. Which seemed fair enough to me if a little insulting.