Additional Time lapse Settings

Rather than just start and end time, I would like to see a setting to do a time lapse for X hours at Y increments would result in 1 frame every 50 seconds at 30frame per second

Also instead of increments a video length option would be great. I have to make 30sec time lapses and always have tho do the math myself, but being able to input 12 hours 32 minutes as the recording period and a 30 second video