Around 5 hours 35 minutes to beat this deceptively difficult 10 minute mode. You have 3 lives and no continues to complete 10 stages. In the run shown I only died once, so I left it unedited. I break my strategies down in this video.
I always reccomend using save states to do a practice run through these old games initially. Complete each stage atleast once, making a checkpoint at the start of each stage. After that you can start doing full runs and practice the stages you are getting stuck on until you are able to break through and beat all 10 stages. Watching this video first should save you alot of time too.
1