depends on how long... 1 year is no big deal... 10 years can be nasty... depends on the thing... if it demonstrates skills that are highly relevant to employer

depends on how long... 1 year is no big deal... 10 years can be nasty... depends on the thing... if it demonstrates skills that are highly relevant to employers, then great... if random, then your skills can look atrophied... depends on the impact... if it got traction of any kind that can be a big win even if the money didn't work out...