BGP prefix list in - clear ip bgp
I am looking at blocking routes coming into BGP.
I have a simple topology and this configuration- I am just blocking the prefix 18.104.22.168/32 into R1
R1 router bgp 65500
network 22.214.171.124 mask 255.255.255.255
network 10.0.12.0 mask 255.255.255.0
network 10.0.13.0 mask 255.255.255.0
neighbor 10.0.12.2 remote-as 65501
neighbor 10.0.12.2 prefix-list block2 in
ip prefix-list block2 seq 5 deny 126.96.36.199/32
My question is what timer determines when this changes? When does an automatic route-refresh occur?
Because as far as I can tell it will stay there forever until you do a manual route-refresh?
I normally just do a quick clear ip bgp * soft in after anything like this but - wondered today how long it would take if I didn't?
Just trying to understand BGP more