It depends on the individual. these thing and the conditions leading to and around them make it a different experience for everyone.
You should grieve for however long you feel you need. The death of a loved one can be very tough to handle so you should just take your time.
I will grieve later. The class will grieve for their slain classmate.
I will grieve during the funeral. The soldiers grieve for their fallen comrade.
Grieve is already a verb. For example "to grieve someone or something" is an action, therefore it is a verb.
Bill Grieve's birth name is William Thomas Turner Grieve.
Yes, the word grieve is a verb.
I will grieve when you are gone.
Percy Grieve died in 1998.
Basil Grieve was born in 1864.
Basil Grieve died in 1917.
Ollie Grieve died in 1978.
Charles Grieve was born in 1913.