This response assumes that the individual is an AFPS 75 member.
The lump sum is normally three times the pension. I say normally as, if there is a pension sharing order or commutation, it is not necessarily so. To find out what the pension is look on the mod website and look at the pension code. The code is set out in lines and columns and you simply go to the line for 22 yrs and read across to the individual's rank - then multiply by three to get the lump sum.
This lump sum is paid by SPVA within 30 days of you leaving the Service - usually quicker than 30 days but the provisions give them 30 days to do it.
If your friend has other pension questions that he does not want to ask COC he could join the The Forces Pension Society and ask our help desk.
Vauxhall's right - up to 30 days after discharge. Though being a friend of the Pension Manager at APC, I know the payments are typically made 7-14 days after discharge. Just make sure that Pensions Form 1 is completed and sent to APC well before discharge - without it the pension can not be paid. The form is sent out with the leavers pack 9 months before discharge, but can be found at the Library link on the JPA Splash Screen.
Also note that any pay due as at discharge date take approx 7 days after discharge to be paid too.
as stated should be within 30 days of discharge, usually sooner but, for anyone who is out on redundancy, bear in mind the fact that the system will be unusually busy and, as far as I am aware, no additional resource is in place to cope so assume worst case.