Table of data

speed fraction of c	time earth frame yr	time on ship yr.	length m	mass kg	fuel kg or L	gamma
0.001	10,000	10,000	10 m	1,000	0.001	1.0000005
0.1	100	99.5	9.95	1,005	10	1.005
0.5	20	17.4	8.7	1,150	300	1.15
0.866	11.5	5.75	5	2,000	2000	2.00
0.707	14.1	10	7.09	1,410	820	1.41
0.99	10.1	1.42	1.4	7,100	12,200	7.1
0.999	10.01	0.455	0.45	22,000	42,000	22
0.9999	10.001	0.14	0.14	71,000	140,000	71
0.99999	10.0001	0.045	0.045	220,000	438,000	220
0.999999	10.00001	0.014	0.014	707,000	1,400,000	707

gamma = 1/(1-v^2/c^2)^0.5

Time earth frame Te= distance/speed = 10 lightyears/v

Time on ship Ts = Te/gamma

length = L/gamma

mass = mass x gamma

fuel energy = mc^2 (gamma-1) = measured in necessary anti-water (plus water) times 2 to start and stop

= 2 x (gamma-1)

for a speed of 0.866c this amount of energy costs $2 * 10^13 or 20 trillion dollars.