Hi Jimmy,
I hope your travels to and from Spain go well and that your time on the Camino is a real blessing.
Pamplona to Logrono in 5 days is very achievable. Great to see you do this section, rather than rush from Sarria to Santiago, just to get your Compostela (certificate). The Camino is out on the senda (pathway), not in a certificate.
Dawn will be coming later each day, so you might be tempted to start in the dark. I found there is no need to begin walking before 8:00 am, or 8:30 am each day.
Have a good journey.
David, Victoria, Canada