Practicing time singing

So I have previously asked before if I was able to do a 10 minute vocal workout and that’s a no go so I was wondering in what amount of time would the limit be for a good vocal workout? I mean I know 1 hour is recommended but I don’t know if it’s possible to sing longer? or what’s the shortest amount of time to get a good workout in? Meaning I could get a good workout in 20-30 minutes if I don’t have time for 1 hour. Or even 25-45 minutes. I’m just curious what amount of time I can settle for if I can’t do an hour. Thank you
Comments