I know the answer to this is "it depends", but where do you think you could get to distance wise for a single event in 4 months? Obviously it depends on training/current levels.
At the moment i do around 2 rides/week of 15-20 miles each. However i'm looking at events to find motivation to up this, and reclaim fitness. In the past (2022 in particular) i was quite happy running in the mountains for >10hrs, but a foot injury has put an end to that. My fitness since Oct 22 has plummeted as a result. Only mentioning that because it shows my body is capable of silly volumes.
I'm looking to sign up for this to drum up some motivation
irongravel.com
The scenery looks amazing and it gives me an excuse to buy stuff (will need some wider tyres). Now the decision comes down to which event to enter
There's the IG360 on April 20th and the Iron Busot on May 25th
The IG360 has 3 distances, of which the easiest is 100km, this doesn't feel long enough to be a challenge (i'm sure it would be as it's off road and hilly), however the next step up is the 226km version with 2500m of ascent. This i wonder if it's a step too far.
The Iron Busot also has 3 distances (55/110/180), the 180km has 5100m of ascent though and climbing is not something i'm good at since i'm fat!