I have subscribed to the standard version of the amélia plugin.

I've tried to follow your advice.

Now for the extras, I've tried adding a price per number of bags.

For time slots, I'm stuck on custom service durations.

My first question, to understand the tool properly, is this: if my working day starts at 9am and lasts until 7pm, why do the time slots start at 8am?

My second question is: how can I customise an extended time slot from 9h00 à 13h00 et de 13h00 à 19h00 ? Is this part of the personalised service?

My third question is: how can I have my time slots below 
- 09h00 - 11h00
- 11h00 - 13h00
- 13h00 - 15h00
- 15h00 - 17h00
- 17h00 - 19h00

As part of the general framework, I have set working hours from 09:00 to 19:00.

I've created the Luggage Storage category with the following services:

- Baggage storage - 2 h
- Baggage storage - half day (this would be the extended range from  09h00 à 13h00  and from 13h00 to 19h00)
- Baggage storage - full day from 09h00 to 19h00

Finally, my last question: I haven't found the parameter to specify that there is no limit to the number of people who can reserve the lockers.

I've attached the url link where I started making the initial settings: https://consigne-bagages-aixlesbains.fr/reservation/ 

I look forward to your reply.