why would you want to do it in 5 days or less? That is quite crazy unless you are coming from another mountain with similar height.
If so, we can do it, if not, we will not organize anything than 6 days, with 7 or more strongly recommended. Even if you are acclimatized, it is a shame to rush it and the costs of the extra days are low compared to the flights you have to make to return for a second attempt..
Read the customer comments about our trips and triplength: http://7summits.com/expeditions.php
Last year I personally guided a 26-person team (age 14-57) to the summit, on a 10 days trip. We hiked every day, spent a night in the crater and everybody (!) summited. Even with one day less, at least 5 people would not have made it.
While we were celebrating (dancing, champagne!) at the summit a party of 6 climbers approached at a snails pace and between vomiting and falling down managed to get a quick summit picture before they had to head down to save their lives.
Yes, they were a 6 day trip, sounds like fun? Just enjoy yourself on a longer trip and as a bonus you will be safer and have a higher summit chance.