Hiit Routine - A query

People often say for example to alternate 1 minute at 60% Heart Rate with 1 min at 90% HR or whatever but I find that it takes me almost a minute getting from 60% HR to 90% HR and another minute in reverse. Therefore if someone recommends doing say, six cycles of 1 min at 60% and 1 min at 90% for a 12 minute routine it would actually take me 24 minutes!

i.e. 6 cycles:

1 min getting HR from 60% to 90%
1 min with HR at 90%
1 min HR coming back down to 60%
1 min with HR at 60%

How do other people factor all this into their routine or am I understanding HIIT all wrong?

Many Thanks
 
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