It took me about a day and a half elapsed to fight my test game to a result. I learned a lot, especially about Vauban's Wars, with which I made a rather daunting start, but which was flowing a lot better by the second day. Although I'd read the book a few times, there is a lot to learn. There is no substitute for just memorising the Combat and Defense values of each unit type - once you've mastered that, things get a lot easier, but for the first two turns I had to read the details of everything that happened, which is really heavy going. After that - after I'd seen most of the things which could happen - things picked up.
Vauban's Wars is Piquet-based, which means it's a very prescriptive, card-driven game, aspects which some people find unappealing, but it is a practical approach, especially for a solo game, and it generates a nice narrative as you go along (or, alternatively, the player(s) will build their own narrative to explain what happened).
My scenario involved an attack on the (fairly modern and tidy) fortress town of San Juan el Timido, somewhere near the Spanish-Portuguese border, in the year 1811. The French commander was the well-connected and irascible Corsican, Général de Division Léonardo, Comte Cindérella, supported by the very capable (though little seen) Général de Brigade Dandini. The fortress has 3 bastions on the table.
The attacking British force was commanded by Major General Sir Paladin Lassiter.
Lassiter's plan was to develop a 2nd Parallel covering the whole south side of the fortress, and then to construct two short 3rd Parallels with a gap in the centre - the intention being to effect a breach on the South-Eastern Bastion (the one on the right from the British viewpoint.
I'll start with a spoiler: the British had such rotten luck during the first 3 game turns (a turn is about half a week, if you are comfortable with such an idea) that any sensible general would have abandoned the siege and tried again another time. In a campaign context, this would have been a no-brainer, but such a proceeding would be of little use for my apprenticeship with the rules, so Lassiter was encouraged to stick with it.
There was a strangely hushed period - the French fortress guns had a few shots at the sappers at work on the approaches, but they were a long way away, they were in good cover and sappers are a poor sort of target anyway. Both generals (being inexperienced!) were nervous about wasting powder, which turned out to be a mistaken approach - the supply of powder is more adequate than you would think, and on balance the rules make it more efficient to give plenty of fire. Since Cindérella was the better of the two commanders, he tended to win most of the initiative rolls (having a D12 against Lassiter's D10), but since the British were making such poor progress he often allowed them to go first, in the hope that the Opportunity Fire rules would give him something to fire at as they approached.