I have had this with both of my girls. My letdown is very fast and almost choked them etc several times a feed. When my milk came in there was way too much then what was needed by my bubs. It did settle down after a few weeks although continued to occur but not the severity for many months. As bub gets bigger they handle a fast letdown better also. You can also lie down and have bub lie on your chest or lie sideways and have bub sort of sitting up so gravity is also not assisting to choke her also IYKWIM, We often do this with mummys who have a fast let down at work and the prems also and it does help to not choke them.
And as for feeding for short periods of 5-10mins then its probably because she is getting full quickly from a fast let down not from giving up because of choking. It can be abit challenging now trying not to drown her with your milk but once she grows into the supply or your supply decreases as your only producing what she requires then you shouldn't have any problems with maintaining a very healthy supply for her. Lots of milk is usually a good thing at this stage just takes some time to produce the needed amount not 5times the amount. And a woman who's milk comes out quick can get the same amount of milk in 5mins then a lady who's milk comes out slow and takes 30mins hence the time differenced in feeds from one baby/mother to another.