I just finished a 7.66km cycle that lasted about 0hh:21mm:15ss !
I really struggled with power on my first ride for 10 months on Friday, but I definitely felt a little bit of improvement today. I think I just haven't used the different parts of the muscle that are used during cycling for a long while, so my legs just aren't really used to pushing out watts. A couple more rides and I don't think that should be a problem, and then I can focus on ramping up the distance. There's a local 100 mile sportive at the start of September, so I definitely have my eyes on riding that and hopefully a few months is enough to properly get some training in!