There's been much talk recently about the speed at which Mick Jagger seemingly got over his relationship with L'Wren Scott and starting dating again. The British press has had the knives out saying he has not given enough appropriate grieving time between her suicide and the next notch on his bedpost. Ultimately it's his affair - quite literally - so who are any of us to criticise? But how long is enough or how soon is enough? How long is a piece of string? There are so many things to take into account.
First we are all differerent. Some people need other people around them all the time to function. They can't pay a bill or book a holiday or even boil an egg without the other person doing it for them or helping them with it. They may need someone at their side for confidence or on their arm for image. Others can manage very well on their own, or were the one more in charge of the partnership anyway, so that when they are on their own again, there is little change in the way they go about things.
Then there is the amount of time the couple spent together before one of them left. I imagine you would get over a relationship of four years quicker than you would one of forty years, as there are by ratio less/more shared experiences together. If your life together far exceeded the time you had before you met, that will also play a part in how easily you can accept the parting.
Yet another factor is is the nature of the relationship and the manner in which one left it. Were they happy together? Miserable? Chugging along in a mediocre way for the sake of childen? Was it acrimonious? Was the death a release from a life of hell together? Was it a slow agonising death, where the actual passing was a relief for both parties? Or was it sudden with no chance to say goodbye, leaving things unsaid, unfinished and a with shedload of guilt?
Age may play a part too. You may be more ready to move on and adapt to someone new if you are younger, less so when you are getting on a bit, although, having said that, there are still stories in the papers of 90-somethings finding true love in old folks' homes and staggering down the aisle on their zimmer frames!
Any combination of these things can produce a completely different result (where √x=6y+a²) and even in similar situations, individual people (by sheer nature) will react differently. I personally marvel that Mick Jagger can move on so quickly after 13 years with someone he claims to have loved, but then again maybe he is trying to put on one face for the public whilst grieving inwardly.
All I can say personally, looking at my √x=6y+a², is that it is over four years since Greg died and I simply cannot envisage ever being ready again in my lifetime to even date someone else, let alone marry them. Forty years together (married for 36 of them) means a lot of shared memories, although admittedly a mountain of grief towards the last 5 years before he died and a tsunami of emotions ever since. You certainly don't get over that in a hurry. Even if Richard Gere, George Clooney, David Beckham and Gary Barlow were all to turn up on my doorstep.