First of all, you should allways close the POS sessions on day to day.

To solve time out problems you need to tweak your Odoo and Postgresql config files. For instance, on a recent inventory operation I had to multiply the CPU time limit per 20.

In Odoo, do you use workers ? Did you setup CPU time limit and Ram limit ? In Postgresql, did you changed the config settings (may be with pgtune) ? If you answered "No" to one of these questions please copy-paste your odoo.conf and tell us more about your hardware (memory, cpu and disk).

How to fix your time-out problem

Tune Postgresql settings

Odoo is mostly data-driven and all those datas are handled by Postgresql. When you close the POS session, a lot of datas regarding accounting, stock and products are written in the Postgresql database. Obviously, the first thing to do is to improve Postgresql speed. And luckily this is quite easy : go to https://pgtune.leopard.in.ua fill the form and it will return all you need to change in postgresql.conf (type 200 in Number of Connections).

Tune Odoo settings

The reference document is Deploying Odoo in the developper documentation (https://www.odoo.com/documentation/13.0/setup/deploy.html) and the various talks from Olivier Dony at the Odoo Experience, like this one https://www.slideshare.net/openobject/performance2014-35689113 and this one https://www.youtube.com/watch?v=A_BWyFeGgVA

By setting up a reverse proxy and  a cache (with Nginx) you would be able to enable workers in Odoo and to save some CPU time. Unfortunatly, workers are not available on Windows. Following parameters are all per workers, in your case I calculate with one worker.

dbmaxconn = 190 a bit lower than Postgresql max_connections. Pgtune will probably give you 200

limits should keep rooms for Postgresql and should maximize CPU usage. Let's divide equally your Ram between Odoo and Postgresql. Postgresql will probably use less than 2GB so you will have 2GB free for Windows.

limit_memory_hard = 4294967296 (4GB)
limit_memory_soft  = 3758096384 (3,5GB)

Following should be enough. These are big numbers.
limit_request = 8192
limit_time_cpu = 800
limit_time_real = 1400

Windows

There are usualy limits in the kernel. On a desktop system, they are lower than on a server. One can increase them but I don't know precisely how to do that on Windows. You should free windows as much as you can from userspace program. Keep it out of the network. It will save CPU time.

Try on Linux

I can't help with Windows tweaking, but I know how to increase Odoo performances on Linux (basicaly using Workers). Hence I suggest to install Linux on a small partition on your laptop. Odoo is nearly a one-click install on Debian, Ubuntu, Fedora, Red Hat and Centos. If you are not comfortable with command-line, you can install a Desktop version.

Check your Postgresql version from Windows 10 first and please report it. This will help with Linux choice

or use a small VPS server

This can be a good and low-cost option and I will be able to connect in if you want.

In any case, ask for more help if it don't work.

Hello Xavier, 

Thank you for your quick feedback. It is a long story why we didn't close the POS session but this is a mistake I agree.

The answer to all the question is no, no workers, no CPU or RAM limit, no change to Postgres config or odoo config.

my laptop is an i7 with 8G RAM and ssd hard drive so good enough I suppose.

my odoo.conf looks like : 

"

[options]

addons_path = C:\Program Files (x86)\Odoo 10.0\server\odoo\addons

admin_passwd = admin

bin_path = C:\Program Files (x86)\Odoo 10.0\thirdparty

csv_internal_sep = ,

data_dir = C:\Users\BENHIMA\AppData\Local\OpenERP S.A\Odoo

db_host = localhost

db_maxconn = 64

db_name = False

db_password = openpgpwd

db_port = 5432

db_template = template1

db_user = openpg

dbfilter = .*

demo = {}

email_from = False

geoip_database = /usr/share/GeoIP/GeoLite2-City.mmdb

import_partial = 

limit_memory_hard = None

limit_memory_soft = None

limit_request = None

limit_time_cpu = None

limit_time_real = None

limit_time_real_cron = None

list_db = True

log_db = False

log_db_level = warning

log_handler = :INFO

log_level = info

logfile = C:\Program Files (x86)\Odoo 10.0\server\odoo.log

logrotate = False

longpolling_port = 8072

max_cron_threads = 2

osv_memory_age_limit = 1.0

osv_memory_count_limit = False

pg_path = C:\Program Files (x86)\Odoo 10.0\PostgreSQL\bin

pidfile = None

proxy_mode = False

reportgz = False

server_wide_modules = web,web_kanban

smtp_password = False

smtp_port = 25

smtp_server = localhost

smtp_ssl = False

smtp_user = False

syslog = False

test_commit = False

test_enable = False

test_file = False

test_report_directory = False

translate_modules = ['all']

unaccent = False

without_demo = False

workers = None

xmlrpc = True

xmlrpc_interface = 

xmlrpc_port = 8069

"

I really appreciate your help and your time.

Best regards, 

Abdel.