How long does it take to replace a headlight assembly?

Hey there! I was wondering how long it usually takes to replace a headlight assembly? My car's headlight is acting up and I'm trying to figure out if this is something I can tackle over the weekend or if I should plan for a full day project. I'm pretty handy with basic car maintenance, but I've never replaced a headlight assembly before. What's the typical time range for this kind of job?