too many regions

Hi

I'm using a hbase0.94.2 cluster, which has 3 zookeepers， 17
regionservers, about 40000 regions. each regionserver has about 2300
regions.

Maybe the cluster has too many regions.

1、If a regionserver die,how long hmaster reassign the regionserver's
2300 regions .

If I restart hbase, how long will it take.

Can I estimate it

2、Can I set hbase.hregion.max.filesize to 10G in hbase0.94.2

Thanks