In one practical word - no.
First of all, you need to give more charge back to the battery than what you remove since the charge efficiency is about 90%. You normally don't want to discharge a deep-cycle battery more than about 25% of it's actual capacity on a regular basis if you want reasonable battery life. If it's a starting battery, a 10% limit is better. I say actual capacity because a battery loses capacity as it ages and is used. A rule-of-thumb for a well-cared for battery, that has not been chronically undercharged, is 8% per year. Mis-treat it and it can be a lot more.
So, a conservative design that, after four years, would still provide you sufficient capacity so that you needn't discharge more than 25% in your 7 day carry-over time, would require a new battery capacity of 412 Ah. I know, it sounds like overkill to power one 24 watt light and many people compromise this.
Actually, it's C/10, C/100, etc. You divide the actual capacity (C) by a factor to obtain a rate in amperes. It refers to a charge or discharge rate, not capacity per se. For example, another rule-of-thumb is that you shouldn't charge a battery at a rate greater than C/10. For that 412Ah battery, the charge current should be limited to 41 Amps.