The clock is ticking on Henson's hopes of achieving a career ambition by featuring in a Rugby World Cup - and he knows it.
And it is why he intends doing everything he possibly can to be aboard the Wales squad's New Zealand-bound flight in just three months' time.
Henson will run out against the Barbarians in Cardiff on Saturday after a season when he ended his long self-imposed exile from rugby through brief stints with Saracens and Toulon.
And despite not being offered a new contract by the wealthy French club, who also suspended him following an altercation with a team-mate after he helped Toulon beat Toulouse in April, Henson is thinking only about Wales following his recall by coach Warren Gatland.
"It's great to be back," he said. "I am over the moon to get this chance - I have really missed it.
"I feel mentally refreshed. Yes, I would love to come into this match on the back of 20 games under my belt or something, but that's not the case.
"But I have got a chance here, and I will do everything I can on Saturday to hopefully force my way into these August internationals (Wales play England twice and Argentina), and then looking forward to the World Cup.
"At this moment in time, Wales is the most important thing for me. I have never been to a World Cup, and this is my only chance to try to make it right. I want to do everything I can.
"The World Cup is the biggest stage, and it is something I have missed out on twice. It is a huge driving factor in me - I really want to be on that plane.
"But I have got a lot to do. I am down the pecking order at the moment, which is fair enough.
"For me, the World Cup is the biggest spectacle, the biggest thing in a rugby career. I've never been to one.
"I have watched football World Cups a lot, and they are always massive occasions. I don't want to watch this rugby World Cup on television again.
"I want to be there - I would like to have an influence on the next one."
Henson has not represented Wales since the 2009 RBS 6 Nations campaign.
He subsequently walked away from the game, making appearances on celebrity television shows and retaining a high media profile as a result, and there were many who wondered whether he had the desire to play top-level sport again.
Henson added: "For me, it (exile) was definitely the right decision. I feel much better for it. I just couldn't carry on, mentally, the way I was before.
"I have got my hunger and drive back, and you need that in rugby. You can't play without it. I think Saturday is going to feel like a first cap for me.
"Having had two years out of the game, there were times when I thought I would never put the Wales jersey back on, or a rugby jersey at all, so Saturday will be a good feeling.
"It is massive for me - it all boils down to this one game at the moment."
Henson also opened up on his season so far, and his version of the nightclub bust-up that led to Toulon briefly suspending him - then welcoming him back for their final league game early last month.
"Saracens was an avenue for me to get back into rugby. It didn't work out, and I had an injury, then the offer came from Toulon," he said.
"I loved every second of it, and I am really disappointed we couldn't work something out with Toulon, but these things happen.
"Looking at further options club-wise, I think I would like to stay down in the south of France, but things change all the time - on a daily basis with me - so we will see.
"I am always going to come back to Wales and play at some point - my family are here, my kids are here. That's definitely going to happen.
"Whether that is this season coming up, or in a year or two, I am not really sure. Those decisions I am going to have to make pretty soon.
"I think the French league is an unbelievable league, and I would like to play in it again. It's pretty special when you have 20,000 or 30,000 people watching you play every week.
"For me, it's crazy how things get blown up to the levels that they do, but I should know by now that's how things happen.
"Reflecting back on that night, it was just a clash of personalities. We sorted it out man to man, it wasn't done in public. We are closer for it, and we had a drink a week later together.
"These things go on every week in every rugby club. With the way it happens with me, it gets blown out of all proportion and I have got to live with that and deal with that.
"Half the stuff reported was totally untrue. We sorted it out man to man, and that was it. I get on well with all the (Toulon) players."
And as for his club future, Henson added: "I am not going to rule anything out. Hopefully, there is a job for me somewhere. I wouldn't rule out playing in Wales next year.
"Obviously, I've got a strong allegiance with the Ospreys. They have always been my club, and I would like to give them first option.
"I would like to think they would take me back on if I did come back to Wales, but if not, I will look somewhere else."
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