Jill starts off spending 5 minutes on the phone, and the following day she spends double that 5 minutes for 5*2=<<5+5=10>>10 minutes.
The following day Jill spends double the previous day's total of 10 minutes on the phone, for 10*2=<<10*2=20>>20 minutes.
On the fourth day, Jill spends double the previous day's total of 20 minutes on the phone, for 20*2=<<20*2=40>>40 minutes
On the fifth and final day, Jill spends double the previous day's total of 40 minutes on the phone, for 40*2=<<40*2=80>>80 minutes.
All told, Jill spends 5+10+20+40+80= <<5+10+20+40+80=155>>155 minutes on the phone over 5 days.
#### 155