Nice question — I dug around a bit because the title 'Robinsons' can refer to different things depending on country and context. I couldn't find a single, universally known film simply called 'Robinsons' in major English-language databases without more context (year, director, lead actor), so there might be multiple films, a short film, or even a regional release with that title.
When I'm planning a movie night I always check a few places: IMDb, Wikipedia, Letterboxd, and whatever streaming service the film might be on. Those pages usually list the runtime right at the top. If you search Google for "'Robinsons' runtime" in quotes, the snippet often pulls the time from IMDb or a distributor page. For many indie or regional features with short titles like this, runtimes commonly fall between 80 and 110 minutes, while bigger studio-family adventures trend 90–120 minutes — but that's just a general range, not a precise fact about this title.
If you can tell me the year, country, or an actor from the cast, I can look it up and give you the exact runtime. Otherwise, try the steps I mentioned and let me know what you find — I’ll happily confirm it for you and maybe suggest whether it’s a good pick for a weekday night or a full evening marathon.