Should I quit?

I think I (M23) may be at the crossroads that everyone who starts a business while working a full time job hopes to get to! Looking for any wisdom anyone here before me can impart.

First, some background. I’m from a mid size city in northern England 🇬🇧, and had a pretty comfortable upbringing with a traditional middle class family. Mum and Dad both senior professionals, but haven’t taken many risks in life - a philosophy I am trying to at least partially move away from. I started working in IT at 16 straight out of school, and have worked my way up in the “corporate British” world the past 7 years - now holding a position as a mid level technology focused management consultant in the financial services industry, recently graduated from university which I did on the side of my day job, and make roughly £80k (around $100k US), a pretty respectable wage in the U.K., although I know my American peers will make substantially more! I dislike the job/corporate world and have done for some time, but recently this has intensified and I find myself completely disengaged from work - partly because my projects have been boring recently, and partly because I really hate the BS corporate culture. While I don’t like my job, and don’t love management, I’m not sure if it’s fair for me to continue working there much longer when I have this level of apathy towards my role!

A couple of years back I also started consulting on the side, which brings in another £50-£60k for a total personal income of £130k ($160k US). I had moved away but am now back living at home to save money for travelling (my passion/stress outlet), and business venture. Unfortunately because of the massive tax rates in the U.K. (45%!), this doesn’t net out to as much as you’d think, but I have managed to save up £100k ($130k US).

A year ago I started work on my business, an internet service that seeks compensation from airlines on the behalf of passengers by utilising Canadian & European laws, called jet justice (jet justice dot com). The business model/value proposition is pretty simple, we have data from various sources (air traffic control, major adverse events, historic weather) that evaluates whether you have a claim to compensation under these laws (up to £1300/$1700 per passenger, so not chump change!), and then gives you the option to allow us to peruse compensation on your behalf. If you choose to do so, we will send an automated letter to the airline demanding compensation, including evidence that the disruption was their fault (i.e. weather within normal levels, no ATC restrictions etc). About 30% of the time they pay without contest and we get to take our 35% fee for minimal labour, the rest of the time they take some persuading! I have a couple admin people on staff to do this persuading using pre written responses drawn up by a lawyer & with the support of lawyers where this isn’t possible. Failing this, we outsource the claim out to a lawyer entirely who takes the airline to court. The passenger doesn’t need to deal with the airline, understand the rules, or risk losing money on paying a lawyer in case they lose, and we take a % of the claim.

At the moment, this is theoretically doing £20k/month in revenue, with net income of £13k after expenses and marketing costs are deducted, which is great! The only problem is cash flow - that figure is based upon what I (conservatively) expect to bring in when claims are settled, but it takes an average of 2 months from a user going through the form to get the revenue, which is leading to me dipping into my own picket substantially every month to cover the shortfall (£3k+/month). I can afford to do this and live normally WITHOUT dipping into my savings right now, but I am starting to feel burned out with all that is on my plate (90+ hour weeks!), and am starting to feel like a zombie.

My question is this. Do I tough it out another 3-6 months at work until I have a good base built up in the business to start drawing from to replace my income, OR do I quit now and start burning my savings in hopes that it all pans out before I run out? I spend around £3k a month on essential stuff (give my parents money for living here, car, general living expenses etc), and another £3k min a month on the business. Any wisdom would be much appreciated! I guess I’m just worried as I’ve worked VERY hard while everyone I know has gone to university, partied etc, and I don’t want to squander what I’ve built for the sake of a few more months of misery…