[R] Chron object in time series plot

[Manta]

I do not think that importing the time as character will help me, as I need
to perform several operation with them. Again, maybe I am not able to
express clearly enough. Let's just focus on this series:

> breaks
 [1]  70000  71500  73000  74500  80000  81500  83000  84500  90000  91500 
93000  94500 100000 101500 103000 104500
[17] 110000 111500 113000 114500 120000 121500 123000 124500 130000 131500
133000 134500 140000 141500 143000 144500
[33] 150000 151500 153000 154500 160000 161500 163000 164500 170000 171500
173000 174500 180000 181500 183000 184500

I want a simple function that can convert breaks into a treatable object by
'zoo' as follows:

[1] 07:00 07:15 07:30 .... 
..
[33]...
18:00 18:15 18:30 18:45

Is this possible?
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