200 DMD will find if ur wallet is 24/7 only in staking mode
on average 1 block per 10 days

to find blocks more often u need more coins
if u have less coins u will find block less often

100 DMD like once every 20 days
50 DMD like once every 40 days

still luck have shortterm impact

ur 50 DMD might find 4 blocks in a month
and its also possible with bad luck find 5 months no block with ur 50 DMD

the more DMD u have the more often u stake a block the less impact luck have and u will be close to estimated average values