Hi there!
Thank you for taking the time to read my post 
I am using the hotspot on routeros v6.33.3 on a RB2011UiAS without Userman.
In the User setup I have for example 10GB allocated to one user. That one user will then sign-in on 2 devices, but when both devices stay active, it will then be possible for that user account to use 20GB. I see that only when a user session is reset, it updates the limit for that session and the usage for that user.
I am using the hotspot at home to distribute the capped internet between the family, so I have set sessions to always be active (so that you never have to sign in again and again).
Current Hotspot Config:
# jan/01/2016 12:57:33 by RouterOS 6.33.3
# software id = M4G6-SLJF
#
/ip hotspot profile
add dns-name=hotspot.#####.co.za hotspot-address=10.0.0.1 \
http-cookie-lifetime=4w2d name=hsprof1
/ip hotspot
add disabled=no interface=InternalNetwork name=MainHotspot profile=hsprof1
/ip hotspot user profile
set [ find default=yes ] keepalive-timeout=4w2d mac-cookie-timeout=4w2d
/ip hotspot service-port
set ftp disabled=yes
/ip hotspot user
add name=admin password=admin
add limit-bytes-total=9000000000 name=daniel password=######
add limit-bytes-total=9000000000 name=werner password=######
add limit-bytes-total=10000000000 name=renier password=######
add limit-bytes-total=10000000000 name=kantoor password=######
add limit-bytes-total=10000000000 name=dalene password=######
add limit-bytes-total=10000000000 name=danie password=######
add limit-bytes-total=1000000000 name=daniel-foon password=######
add limit-bytes-total=1000000000 name=werner-foon password=######
add limit-bytes-total=200000000 name=gunter password=######
/ip hotspot walled-garden
add comment="place hotspot rules here" disabled=yes
/ip hotspot walled-garden ip
add action=accept disabled=no dst-address=10.0.0.1
add action=accept comment=Kantoor disabled=no src-address=10.0.0.20
add action=accept disabled=no src-address=10.0.4.0/24
add action=accept disabled=no src-address=10.0.1.0/24
add action=accept disabled=no src-address=10.0.2.0/24
add action=accept disabled=no src-address=10.0.3.0/24
add action=accept disabled=no src-address=10.0.5.0/24
add action=accept comment=Efergy disabled=no src-address=10.0.0.5
Will it be possible to let the router update the usage in real-time?
Thank you!!